From afc5e50c08d8f286655b27f8281d9ed24995d631 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 14:21:32 +0000 Subject: [PATCH 01/23] Add append-only mapped file abstraction with tests and benchmark Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/463b57a0-9374-4236-8178-d094a7d9bc95 Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- index.js | 1 + package.json | 2 + src/AppendOnlyMmapedFile.js | 8 + src/File/AppendOnlyMmapedFile.js | 285 ++++++++++++++++++++++++++++++ test/AppendOnlyMmapedFile.spec.js | 83 +++++++++ 5 files changed, 379 insertions(+) create mode 100644 src/AppendOnlyMmapedFile.js create mode 100644 src/File/AppendOnlyMmapedFile.js create mode 100644 test/AppendOnlyMmapedFile.spec.js diff --git a/index.js b/index.js index 4cfbb2d..77bf327 100644 --- a/index.js +++ b/index.js @@ -3,3 +3,4 @@ export { default as EventStream } from './src/EventStream.js'; export { default as Storage, StorageLockedError } from './src/Storage.js'; export { default as Index } from './src/Index.js'; export { default as Consumer } from './src/Consumer.js'; +export { default as AppendOnlyMmapedFile } from './src/AppendOnlyMmapedFile.js'; diff --git a/package.json b/package.json index f989889..c94c462 100644 --- a/package.json +++ b/package.json @@ -46,6 +46,8 @@ "src/util.js", "src/fsUtil.js", "src/metadataUtil.js", + "src/AppendOnlyMmapedFile.js", + "src/File/*.js", "index.js" ], "license": "MIT", diff --git a/src/AppendOnlyMmapedFile.js b/src/AppendOnlyMmapedFile.js new file mode 100644 index 0000000..4d8574c --- /dev/null +++ b/src/AppendOnlyMmapedFile.js @@ -0,0 +1,8 @@ +import WritableAppendOnlyMmapedFile, { ReadableAppendOnlyMmapedFile, ReadOnlyAppendOnlyMmapedFile, FILE_SIZE_MARKER_SIZE } from './File/AppendOnlyMmapedFile.js'; + +WritableAppendOnlyMmapedFile.ReadOnly = ReadOnlyAppendOnlyMmapedFile; +WritableAppendOnlyMmapedFile.Readable = ReadableAppendOnlyMmapedFile; +WritableAppendOnlyMmapedFile.FILE_SIZE_MARKER_SIZE = FILE_SIZE_MARKER_SIZE; + +export default WritableAppendOnlyMmapedFile; +export { ReadableAppendOnlyMmapedFile as Readable, ReadOnlyAppendOnlyMmapedFile as ReadOnly, FILE_SIZE_MARKER_SIZE }; diff --git a/src/File/AppendOnlyMmapedFile.js b/src/File/AppendOnlyMmapedFile.js new file mode 100644 index 0000000..21da1b0 --- /dev/null +++ b/src/File/AppendOnlyMmapedFile.js @@ -0,0 +1,285 @@ +import fs from 'fs'; +import path from 'path'; +import events from 'events'; +import WatchesFile from '../WatchesFile.js'; +import { ensureDirectory } from '../fsUtil.js'; +import { alignTo, assert } from '../util.js'; + +const FILE_SIZE_MARKER_SIZE = 4; +const DEFAULT_PAGE_SIZE = 4096; +const DEFAULT_WRITE_BUFFER_SIZE = 16 * 1024; + +class ReadableAppendOnlyMmapedFile extends events.EventEmitter { + + constructor(name, options = {}) { + super(); + assert(typeof name === 'string' && name !== '', 'Must specify a file name.'); + const config = Object.assign({ + dataDirectory: '.', + pageSize: DEFAULT_PAGE_SIZE, + writeBufferSize: DEFAULT_WRITE_BUFFER_SIZE + }, options); + + this.name = name; + this.dataDirectory = path.resolve(config.dataDirectory); + this.fileName = path.resolve(this.dataDirectory, name); + this.pageSize = Math.max(4, config.pageSize >>> 0); // jshint ignore:line + this.writeBufferSize = Math.max(4, config.writeBufferSize >>> 0); // jshint ignore:line + + this.fileMode = 'r'; + this.fd = null; + this.fileSize = 0; + this.mappedSize = 0; + this.mapBuffer = null; + this.dirtyFrom = -1; + this.dirtyTo = -1; + } + + isOpen() { + return !!this.fd; + } + + open() { + if (this.fd) { + return false; + } + this.fd = fs.openSync(this.fileName, this.fileMode); + this.remap(); + return true; + } + + close() { + this.unmap(); + if (this.fd) { + fs.closeSync(this.fd); + this.fd = null; + } + } + + map(size) { + this.mappedSize = size; + this.mapBuffer = Buffer.allocUnsafeSlow(size); + this.mapBuffer.fill(0); + if (size > 0) { + fs.readSync(this.fd, this.mapBuffer, 0, size, 0); + } + } + + unmap() { + this.mapBuffer = null; + this.mappedSize = 0; + this.clearDirtyRange(); + } + + readFileSizeMarker() { + if (this.mappedSize < FILE_SIZE_MARKER_SIZE) { + return -1; + } + const markerPos = this.mappedSize - FILE_SIZE_MARKER_SIZE; + const backwardsOffset = this.mapBuffer.readUInt32BE(markerPos); + const size = this.mappedSize - backwardsOffset; + if (size < 0 || size > markerPos) { + return -1; + } + return size; + } + + detectFileSize() { + if (this.mappedSize <= FILE_SIZE_MARKER_SIZE) { + return 0; + } + const limit = this.mappedSize - FILE_SIZE_MARKER_SIZE; + for (let position = limit - 4; position >= 0; position -= 4) { + if (this.mapBuffer.readUInt32BE(position) !== 0) { + return position + 4; + } + } + return 0; + } + + remap() { + assert(this.fd, 'File is not opened.'); + const stat = fs.fstatSync(this.fd); + this.unmap(); + this.map(stat.size); + const markedSize = this.readFileSizeMarker(); + this.fileSize = markedSize >= 0 ? markedSize : this.detectFileSize(); + } + + writeFileSizeMarker() { + assert(this.mapBuffer !== null, 'File is not mapped.'); + assert(this.fileSize <= this.mappedSize - FILE_SIZE_MARKER_SIZE, 'Invalid file size marker range.'); + const markerPos = this.mappedSize - FILE_SIZE_MARKER_SIZE; + const backwardsOffset = this.mappedSize - this.fileSize; + this.mapBuffer.writeUInt32BE(backwardsOffset >>> 0, markerPos); // jshint ignore:line + this.markDirty(markerPos, markerPos + FILE_SIZE_MARKER_SIZE); + } + + markDirty(from, to) { + if (this.dirtyFrom === -1) { + this.dirtyFrom = from; + this.dirtyTo = to; + return; + } + this.dirtyFrom = Math.min(this.dirtyFrom, from); + this.dirtyTo = Math.max(this.dirtyTo, to); + } + + clearDirtyRange() { + this.dirtyFrom = -1; + this.dirtyTo = -1; + } + + flush() { + if (!this.fd || this.dirtyFrom < 0) { + return false; + } + fs.writeSync(this.fd, this.mapBuffer, this.dirtyFrom, this.dirtyTo - this.dirtyFrom, this.dirtyFrom); + this.clearDirtyRange(); + return true; + } + + read(position, length) { + assert(this.mapBuffer !== null, 'File is not mapped.'); + assert(position >= 0, 'Position must be >= 0.'); + assert(length >= 0, 'Length must be >= 0.'); + assert(position + length <= this.fileSize, 'Read exceeds file size.'); + return this.mapBuffer.subarray(position, position + length); + } + + readString(position, length, encoding = 'utf8') { + return this.read(position, length).toString(encoding); + } + + truncate(size) { + assert(this.mapBuffer !== null, 'File is not mapped.'); + size = Math.max(0, size); + if (size >= this.fileSize) { + return false; + } + const previousSize = this.fileSize; + this.mapBuffer.fill(0, size, this.fileSize); + this.fileSize = size; + this.markDirty(size, previousSize); + this.writeFileSizeMarker(); + return true; + } +} + +class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { + + constructor(name, options = {}) { + super(name, options); + this.fileMode = 'r+'; + this.initialData = options.initialData ? Buffer.from(options.initialData) : null; + } + + computeMappedSize(actualSize) { + const requestedSize = actualSize + this.writeBufferSize + FILE_SIZE_MARKER_SIZE; + return requestedSize + alignTo(requestedSize, this.pageSize); + } + + initializeNewFile() { + const initialSize = this.initialData ? this.initialData.byteLength : 0; + this.fileSize = initialSize; + this.mappedSize = this.computeMappedSize(initialSize); + fs.ftruncateSync(this.fd, this.mappedSize); + this.map(this.mappedSize); + if (this.initialData && this.initialData.byteLength > 0) { + this.initialData.copy(this.mapBuffer, 0); + this.markDirty(0, this.initialData.byteLength); + } + this.writeFileSizeMarker(); + this.flush(); + } + + open() { + if (this.fd) { + return false; + } + ensureDirectory(this.dataDirectory); + try { + this.fd = fs.openSync(this.fileName, this.fileMode); + } catch (e) { + if (e.code !== 'ENOENT') { + throw e; + } + this.fd = fs.openSync(this.fileName, 'w+'); + } + const stat = fs.fstatSync(this.fd); + if (stat.size === 0) { + this.initializeNewFile(); + return true; + } + + this.remap(); + const wantedMappedSize = this.computeMappedSize(this.fileSize); + if (this.mappedSize < wantedMappedSize) { + this.grow(this.fileSize); + } + this.writeFileSizeMarker(); + this.flush(); + return true; + } + + grow(requiredFileSize) { + const nextMappedSize = this.computeMappedSize(requiredFileSize); + if (nextMappedSize <= this.mappedSize) { + return false; + } + this.flush(); + this.unmap(); + fs.ftruncateSync(this.fd, nextMappedSize); + this.map(nextMappedSize); + this.fileSize = requiredFileSize; + this.writeFileSizeMarker(); + return true; + } + + write(data) { + assert(this.mapBuffer !== null, 'File is not mapped.'); + const buffer = Buffer.isBuffer(data) ? data : Buffer.from(data); + const writePosition = this.fileSize; + const endPosition = writePosition + buffer.byteLength; + if (endPosition > this.mappedSize - FILE_SIZE_MARKER_SIZE) { + this.grow(endPosition); + } + buffer.copy(this.mapBuffer, writePosition); + this.fileSize = endPosition; + this.markDirty(writePosition, endPosition); + this.writeFileSizeMarker(); + return writePosition; + } + + close() { + this.flush(); + super.close(); + } +} + +class ReadOnlyAppendOnlyMmapedFile extends WatchesFile(ReadableAppendOnlyMmapedFile) { + + onChange() { + if (!this.fd) { + return; + } + const previousSize = this.fileSize; + this.remap(); + if (this.fileSize > previousSize) { + this.emit('append', previousSize, this.fileSize); + } + if (this.fileSize < previousSize) { + this.emit('truncate', previousSize, this.fileSize); + } + } + + onRename() { + this.close(); + } +} + +WritableAppendOnlyMmapedFile.ReadOnly = ReadOnlyAppendOnlyMmapedFile; +WritableAppendOnlyMmapedFile.Readable = ReadableAppendOnlyMmapedFile; + +export default WritableAppendOnlyMmapedFile; +export { ReadableAppendOnlyMmapedFile, ReadOnlyAppendOnlyMmapedFile, FILE_SIZE_MARKER_SIZE }; diff --git a/test/AppendOnlyMmapedFile.spec.js b/test/AppendOnlyMmapedFile.spec.js new file mode 100644 index 0000000..25289d7 --- /dev/null +++ b/test/AppendOnlyMmapedFile.spec.js @@ -0,0 +1,83 @@ +import expect from 'expect.js'; +import fs from 'fs-extra'; +import { execFile } from 'child_process'; +import { once } from 'events'; +import { promisify } from 'util'; +import { fileURLToPath } from 'url'; +import AppendOnlyMmapedFile, { ReadOnly as ReadOnlyAppendOnlyMmapedFile, Readable as ReadableAppendOnlyMmapedFile } from '../src/AppendOnlyMmapedFile.js'; + +const execFileAsync = promisify(execFile); +const __dirname = fileURLToPath(new URL('.', import.meta.url)); +const dataDirectory = __dirname + 'data'; + +describe('AppendOnlyMmapedFile', function () { + + beforeEach(function () { + fs.emptyDirSync(dataDirectory); + }); + + it('writes and reads appended data', function () { + const writer = new AppendOnlyMmapedFile('.mapped', { + dataDirectory, + pageSize: 64, + writeBufferSize: 64, + initialData: Buffer.from('HEAD') + }); + writer.open(); + const position = writer.write('hello'); + writer.flush(); + writer.close(); + + expect(position).to.be(4); + + const reader = new ReadableAppendOnlyMmapedFile('.mapped', { + dataDirectory, + pageSize: 64, + writeBufferSize: 64 + }); + reader.open(); + expect(reader.readString(0, 4)).to.be('HEAD'); + expect(reader.readString(4, 5)).to.be('hello'); + reader.close(); + }); + + it('remaps and emits append in readonly mode for a small cross-process flush', async function () { + const writer = new AppendOnlyMmapedFile('.mapped', { + dataDirectory, + pageSize: 4096, + writeBufferSize: 256, + initialData: Buffer.from('HEAD') + }); + writer.open(); + writer.flush(); + writer.close(); + + const reader = new ReadOnlyAppendOnlyMmapedFile('.mapped', { + dataDirectory, + pageSize: 4096, + writeBufferSize: 256 + }); + reader.open(); + + const appendPromise = once(reader, 'append'); + const script = ` + import AppendOnlyMmapedFile from '${fileURLToPath(new URL('../src/AppendOnlyMmapedFile.js', import.meta.url)).replace(/\\/g, '\\\\')}'; + const writer = new AppendOnlyMmapedFile('.mapped', { + dataDirectory: '${dataDirectory.replace(/\\/g, '\\\\')}', + pageSize: 4096, + writeBufferSize: 256 + }); + writer.open(); + writer.write('abc'); + writer.flush(); + writer.close(); + `; + await execFileAsync(process.execPath, ['--input-type=module', '-e', script], { cwd: dataDirectory }); + + const [previousSize, newSize] = await appendPromise; + expect(newSize - previousSize).to.be(3); + expect(reader.readString(previousSize, 3)).to.be('abc'); + reader.close(); + }); + +}); From b3bc297b80c3495de1efe417a8b97526003a5719 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 14:23:38 +0000 Subject: [PATCH 02/23] Add mapped file throughput benchmark script Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/463b57a0-9374-4236-8178-d094a7d9bc95 Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- scripts/bench-mmap-file.js | 43 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 scripts/bench-mmap-file.js diff --git a/scripts/bench-mmap-file.js b/scripts/bench-mmap-file.js new file mode 100644 index 0000000..7b1d047 --- /dev/null +++ b/scripts/bench-mmap-file.js @@ -0,0 +1,43 @@ +import fs from 'fs-extra'; +import { hrtime } from 'process'; +import AppendOnlyMmapedFile from '../src/AppendOnlyMmapedFile.js'; + +const dataDirectory = 'data/bench-mmap'; +const writeCount = 200000; + +function measure(name, payload) { + const file = new AppendOnlyMmapedFile(`${name}.mapped`, { + dataDirectory, + writeBufferSize: 64 * 1024 + }); + file.open(); + const start = hrtime.bigint(); + for (let index = 0; index < writeCount; index++) { + file.write(payload); + } + file.flush(); + const end = hrtime.bigint(); + file.close(); + + const seconds = Number(end - start) / 1e9; + const throughput = Math.round(writeCount / seconds); + const mbPerSecond = ((payload.byteLength * writeCount) / (1024 * 1024 * seconds)).toFixed(2); + return { throughput, mbPerSecond, seconds: seconds.toFixed(3) }; +} + +fs.emptyDirSync(dataDirectory); + +const indexPayload = Buffer.alloc(16, 7); +const storagePayload = Buffer.from(JSON.stringify({ + doc: 'this is some test document for measuring performance', + value: 123.45, + amount: 999, + pad: ' '.repeat(32) +})); + +const indexResult = measure('index-16-byte', indexPayload); +const storageResult = measure('storage-like', storagePayload); + +console.log('AppendOnlyMmapedFile throughput benchmark'); +console.log(`index-like 16B writes: ${indexResult.throughput}/s (${indexResult.mbPerSecond} MiB/s, ${indexResult.seconds}s)`); +console.log(`storage-like ${storagePayload.byteLength}B writes: ${storageResult.throughput}/s (${storageResult.mbPerSecond} MiB/s, ${storageResult.seconds}s)`); From e3aeef76bb342afb5f9224ab0f49d3f96f5c12a7 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 14:44:14 +0000 Subject: [PATCH 03/23] Use @riaskov/mmap-io for true file memory mapping Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/18ebd1ff-e382-4dfa-9a50-a60060a9c0a8 Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- package-lock.json | 2416 ++++++++++++++++++++++++++---- package.json | 1 + src/File/AppendOnlyMmapedFile.js | 19 +- 3 files changed, 2177 insertions(+), 259 deletions(-) diff --git a/package-lock.json b/package-lock.json index 61f4abb..2fa8754 100644 --- a/package-lock.json +++ b/package-lock.json @@ -9,6 +9,7 @@ "version": "1.1.0", "license": "MIT", "dependencies": { + "@riaskov/mmap-io": "^1.4.3", "mkdirp": "^3.0.1" }, "devDependencies": { @@ -36,7 +37,6 @@ "version": "8.0.2", "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz", "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==", - 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"sha512-WrcA6AyEfqDX5bWige/4NQfPZMtASNVxdmWR76WESYQVAACSgWcR6e9i0mofqqBxYFtL4oAxPIptY73/0YE1DQ==", + "requires": { + "imurmurhash": "^0.1.4" + } + }, "universalify": { "version": "2.0.0", "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.0.tgz", "integrity": "sha512-hAZsKq7Yy11Zu1DE0OzWjw7nnLZmJZYTDZZyEFHZdUhV8FkH5MCfoU1XMaxXovpyW5nq5scPqq0ZDP9Zyl04oQ==", "dev": true }, + "util-deprecate": { + "version": "1.0.2", + "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz", + "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==" + }, "v8-to-istanbul": { "version": "9.3.0", "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-9.3.0.tgz", @@ -2289,15 +4169,36 @@ } } }, + "webidl-conversions": { + "version": "3.0.1", + "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz", + "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==" + }, + "whatwg-url": { + "version": "5.0.0", + "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz", + "integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==", + "requires": { + "tr46": "~0.0.3", + "webidl-conversions": "^3.0.0" + } + }, "which": { "version": "2.0.2", "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz", "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==", - "dev": true, "requires": { "isexe": "^2.0.0" } }, + "wide-align": { + "version": "1.1.5", + "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.5.tgz", + "integrity": "sha512-eDMORYaPNZ4sQIuuYPDHdQvf4gyCF9rEEV/yPxGfwPkRodwEgiMUUXTx/dex+Me0wxx53S+NgUHaP7y3MGlDmg==", + "requires": { + "string-width": "^1.0.2 || 2 || 3 || 4" + } + }, "workerpool": { "version": "9.3.4", "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-9.3.4.tgz", @@ -2319,19 +4220,28 @@ "version": "npm:wrap-ansi@7.0.0", "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz", "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==", - "dev": true, "requires": { "ansi-styles": "^4.0.0", "string-width": "^4.1.0", "strip-ansi": "^6.0.0" } }, + "wrappy": { + "version": "1.0.2", + "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz", + "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==" + }, "y18n": { "version": "5.0.8", "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz", "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==", "dev": true }, + "yallist": { + "version": "4.0.0", + "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz", + "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==" + }, "yargs": { "version": "17.7.2", "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz", diff --git a/package.json b/package.json index c94c462..e54c798 100644 --- a/package.json +++ b/package.json @@ -61,6 +61,7 @@ "node": ">=18.0" }, "dependencies": { + "@riaskov/mmap-io": "^1.4.3", "mkdirp": "^3.0.1" }, "devDependencies": { diff --git a/src/File/AppendOnlyMmapedFile.js b/src/File/AppendOnlyMmapedFile.js index 21da1b0..095553f 100644 --- a/src/File/AppendOnlyMmapedFile.js +++ b/src/File/AppendOnlyMmapedFile.js @@ -1,12 +1,13 @@ import fs from 'fs'; import path from 'path'; import events from 'events'; +import mmap from '@riaskov/mmap-io'; import WatchesFile from '../WatchesFile.js'; import { ensureDirectory } from '../fsUtil.js'; import { alignTo, assert } from '../util.js'; const FILE_SIZE_MARKER_SIZE = 4; -const DEFAULT_PAGE_SIZE = 4096; +const DEFAULT_PAGE_SIZE = mmap.PAGESIZE || 4096; const DEFAULT_WRITE_BUFFER_SIZE = 16 * 1024; class ReadableAppendOnlyMmapedFile extends events.EventEmitter { @@ -58,11 +59,14 @@ class ReadableAppendOnlyMmapedFile extends events.EventEmitter { map(size) { this.mappedSize = size; - this.mapBuffer = Buffer.allocUnsafeSlow(size); - this.mapBuffer.fill(0); - if (size > 0) { - fs.readSync(this.fd, this.mapBuffer, 0, size, 0); + if (size <= 0) { + this.mapBuffer = Buffer.alloc(0); + return; } + const protection = this.fileMode === 'r' + ? mmap.PROT_READ + : mmap.PROT_READ | mmap.PROT_WRITE; + this.mapBuffer = mmap.map(size, protection, mmap.MAP_SHARED, this.fd, 0); } unmap() { @@ -134,7 +138,10 @@ class ReadableAppendOnlyMmapedFile extends events.EventEmitter { if (!this.fd || this.dirtyFrom < 0) { return false; } - fs.writeSync(this.fd, this.mapBuffer, this.dirtyFrom, this.dirtyTo - this.dirtyFrom, this.dirtyFrom); + mmap.sync(this.mapBuffer, true); + const now = new Date(); + fs.futimesSync(this.fd, now, now); + fs.fdatasyncSync(this.fd); this.clearDirtyRange(); return true; } From 531cc20c7108f990fcb4247cdb0e4927b4694bba Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 17:10:58 +0000 Subject: [PATCH 04/23] Refactor AppendOnlyMmapedFile: move write-only methods to writable subclass, use mmap.PAGESIZE, remove dirty tracking Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/46c4e985-12a9-4c87-9e08-8b7c62fa7e27 Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- src/File/AppendOnlyMmapedFile.js | 75 ++++++++++---------------------- 1 file changed, 24 insertions(+), 51 deletions(-) diff --git a/src/File/AppendOnlyMmapedFile.js b/src/File/AppendOnlyMmapedFile.js index 095553f..46e1904 100644 --- a/src/File/AppendOnlyMmapedFile.js +++ b/src/File/AppendOnlyMmapedFile.js @@ -7,7 +7,6 @@ import { ensureDirectory } from '../fsUtil.js'; import { alignTo, assert } from '../util.js'; const FILE_SIZE_MARKER_SIZE = 4; -const DEFAULT_PAGE_SIZE = mmap.PAGESIZE || 4096; const DEFAULT_WRITE_BUFFER_SIZE = 16 * 1024; class ReadableAppendOnlyMmapedFile extends events.EventEmitter { @@ -17,23 +16,18 @@ class ReadableAppendOnlyMmapedFile extends events.EventEmitter { assert(typeof name === 'string' && name !== '', 'Must specify a file name.'); const config = Object.assign({ dataDirectory: '.', - pageSize: DEFAULT_PAGE_SIZE, - writeBufferSize: DEFAULT_WRITE_BUFFER_SIZE }, options); this.name = name; this.dataDirectory = path.resolve(config.dataDirectory); this.fileName = path.resolve(this.dataDirectory, name); - this.pageSize = Math.max(4, config.pageSize >>> 0); // jshint ignore:line - this.writeBufferSize = Math.max(4, config.writeBufferSize >>> 0); // jshint ignore:line + this.pageSize = mmap.PAGESIZE; this.fileMode = 'r'; this.fd = null; this.fileSize = 0; this.mappedSize = 0; this.mapBuffer = null; - this.dirtyFrom = -1; - this.dirtyTo = -1; } isOpen() { @@ -72,7 +66,6 @@ class ReadableAppendOnlyMmapedFile extends events.EventEmitter { unmap() { this.mapBuffer = null; this.mappedSize = 0; - this.clearDirtyRange(); } readFileSizeMarker() { @@ -110,76 +103,58 @@ class ReadableAppendOnlyMmapedFile extends events.EventEmitter { this.fileSize = markedSize >= 0 ? markedSize : this.detectFileSize(); } + read(position, length) { + assert(this.mapBuffer !== null, 'File is not mapped.'); + assert(position >= 0, 'Position must be >= 0.'); + assert(length >= 0, 'Length must be >= 0.'); + assert(position + length <= this.fileSize, 'Read exceeds file size.'); + return this.mapBuffer.subarray(position, position + length); + } + + readString(position, length, encoding = 'utf8') { + return this.read(position, length).toString(encoding); + } +} + +class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { + + constructor(name, options = {}) { + super(name, options); + this.fileMode = 'r+'; + this.writeBufferSize = Math.max(this.pageSize, (options.writeBufferSize >>> 0) || DEFAULT_WRITE_BUFFER_SIZE); // jshint ignore:line + this.initialData = options.initialData ? Buffer.from(options.initialData) : null; + } + writeFileSizeMarker() { assert(this.mapBuffer !== null, 'File is not mapped.'); assert(this.fileSize <= this.mappedSize - FILE_SIZE_MARKER_SIZE, 'Invalid file size marker range.'); const markerPos = this.mappedSize - FILE_SIZE_MARKER_SIZE; const backwardsOffset = this.mappedSize - this.fileSize; this.mapBuffer.writeUInt32BE(backwardsOffset >>> 0, markerPos); // jshint ignore:line - this.markDirty(markerPos, markerPos + FILE_SIZE_MARKER_SIZE); - } - - markDirty(from, to) { - if (this.dirtyFrom === -1) { - this.dirtyFrom = from; - this.dirtyTo = to; - return; - } - this.dirtyFrom = Math.min(this.dirtyFrom, from); - this.dirtyTo = Math.max(this.dirtyTo, to); - } - - clearDirtyRange() { - this.dirtyFrom = -1; - this.dirtyTo = -1; } flush() { - if (!this.fd || this.dirtyFrom < 0) { + if (!this.fd || !this.mapBuffer) { return false; } mmap.sync(this.mapBuffer, true); const now = new Date(); fs.futimesSync(this.fd, now, now); fs.fdatasyncSync(this.fd); - this.clearDirtyRange(); return true; } - read(position, length) { - assert(this.mapBuffer !== null, 'File is not mapped.'); - assert(position >= 0, 'Position must be >= 0.'); - assert(length >= 0, 'Length must be >= 0.'); - assert(position + length <= this.fileSize, 'Read exceeds file size.'); - return this.mapBuffer.subarray(position, position + length); - } - - readString(position, length, encoding = 'utf8') { - return this.read(position, length).toString(encoding); - } - truncate(size) { assert(this.mapBuffer !== null, 'File is not mapped.'); size = Math.max(0, size); if (size >= this.fileSize) { return false; } - const previousSize = this.fileSize; this.mapBuffer.fill(0, size, this.fileSize); this.fileSize = size; - this.markDirty(size, previousSize); this.writeFileSizeMarker(); return true; } -} - -class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { - - constructor(name, options = {}) { - super(name, options); - this.fileMode = 'r+'; - this.initialData = options.initialData ? Buffer.from(options.initialData) : null; - } computeMappedSize(actualSize) { const requestedSize = actualSize + this.writeBufferSize + FILE_SIZE_MARKER_SIZE; @@ -194,7 +169,6 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { this.map(this.mappedSize); if (this.initialData && this.initialData.byteLength > 0) { this.initialData.copy(this.mapBuffer, 0); - this.markDirty(0, this.initialData.byteLength); } this.writeFileSizeMarker(); this.flush(); @@ -253,7 +227,6 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { } buffer.copy(this.mapBuffer, writePosition); this.fileSize = endPosition; - this.markDirty(writePosition, endPosition); this.writeFileSizeMarker(); return writePosition; } From a99e26fb095bd482f41bb3305b6ba519ab644002 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 17:12:29 +0000 Subject: [PATCH 05/23] Move pageSize to writable subclass, simplify writeBufferSize expression Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/46c4e985-12a9-4c87-9e08-8b7c62fa7e27 Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- src/File/AppendOnlyMmapedFile.js | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/File/AppendOnlyMmapedFile.js b/src/File/AppendOnlyMmapedFile.js index 46e1904..aab2283 100644 --- a/src/File/AppendOnlyMmapedFile.js +++ b/src/File/AppendOnlyMmapedFile.js @@ -21,7 +21,6 @@ class ReadableAppendOnlyMmapedFile extends events.EventEmitter { this.name = name; this.dataDirectory = path.resolve(config.dataDirectory); this.fileName = path.resolve(this.dataDirectory, name); - this.pageSize = mmap.PAGESIZE; this.fileMode = 'r'; this.fd = null; @@ -121,7 +120,8 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { constructor(name, options = {}) { super(name, options); this.fileMode = 'r+'; - this.writeBufferSize = Math.max(this.pageSize, (options.writeBufferSize >>> 0) || DEFAULT_WRITE_BUFFER_SIZE); // jshint ignore:line + this.pageSize = mmap.PAGESIZE; + this.writeBufferSize = Math.max(this.pageSize, options.writeBufferSize || DEFAULT_WRITE_BUFFER_SIZE); this.initialData = options.initialData ? Buffer.from(options.initialData) : null; } From 8f87e5e8bf5de2df23064feffb15fd3be275a671 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 17:49:54 +0000 Subject: [PATCH 06/23] Add mmap-backed Index implementation beside existing Index (MmapReadableIndex, MmapWritableIndex, MmapReadOnlyIndex) Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/2d421c70-53fb-4e29-a82f-e3da3bb18748 Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- index.js | 1 + package.json | 1 + src/Index/MmapReadOnlyIndex.js | 40 +++++++ src/Index/MmapReadableIndex.js | 192 +++++++++++++++++++++++++++++++ src/Index/MmapWritableIndex.js | 135 ++++++++++++++++++++++ src/MmapIndex.js | 8 ++ test/MmapIndex.spec.js | 200 +++++++++++++++++++++++++++++++++ 7 files changed, 577 insertions(+) create mode 100644 src/Index/MmapReadOnlyIndex.js create mode 100644 src/Index/MmapReadableIndex.js create mode 100644 src/Index/MmapWritableIndex.js create mode 100644 src/MmapIndex.js create mode 100644 test/MmapIndex.spec.js diff --git a/index.js b/index.js index 77bf327..cf6bf03 100644 --- a/index.js +++ b/index.js @@ -4,3 +4,4 @@ export { default as Storage, StorageLockedError } from './src/Storage.js'; export { default as Index } from './src/Index.js'; export { default as Consumer } from './src/Consumer.js'; export { default as AppendOnlyMmapedFile } from './src/AppendOnlyMmapedFile.js'; +export { default as MmapIndex } from './src/MmapIndex.js'; diff --git a/package.json b/package.json index e54c798..a328758 100644 --- a/package.json +++ b/package.json @@ -47,6 +47,7 @@ "src/fsUtil.js", "src/metadataUtil.js", "src/AppendOnlyMmapedFile.js", + "src/MmapIndex*.js", "src/File/*.js", "index.js" ], diff --git a/src/Index/MmapReadOnlyIndex.js b/src/Index/MmapReadOnlyIndex.js new file mode 100644 index 0000000..4d10b57 --- /dev/null +++ b/src/Index/MmapReadOnlyIndex.js @@ -0,0 +1,40 @@ +import { ReadOnlyAppendOnlyMmapedFile } from '../File/AppendOnlyMmapedFile.js'; +import MmapReadableIndex from './MmapReadableIndex.js'; + +/** + * A read-only, memory-mapped index that watches the underlying file for changes and + * re-maps it automatically. + * + * When the writer appends entries and flushes, the file's logical size increases. + * The ReadOnlyAppendOnlyMmapedFile detects the size change via its file watcher, + * remaps, and emits 'append' / 'truncate' with the previous and new file sizes. + * MmapReadOnlyIndex translates those byte-level deltas into entry-count deltas and + * re-emits them at the index level so callers can react without knowing about the + * underlying file format. + */ +class MmapReadOnlyIndex extends MmapReadableIndex { + + createFile(name, options) { + const file = new ReadOnlyAppendOnlyMmapedFile(name, options); + + file.on('append', (prevFileSize, newFileSize) => { + const prevLength = Math.max(0, Math.floor((prevFileSize - this.headerSize) / this.EntryClass.size)); + const newLength = Math.max(0, Math.floor((newFileSize - this.headerSize) / this.EntryClass.size)); + if (newLength > prevLength) { + this.emit('append', prevLength, newLength); + } + }); + + file.on('truncate', (prevFileSize, newFileSize) => { + const prevLength = Math.max(0, Math.floor((prevFileSize - this.headerSize) / this.EntryClass.size)); + const newLength = Math.max(0, Math.floor((newFileSize - this.headerSize) / this.EntryClass.size)); + if (newLength < prevLength) { + this.emit('truncate', prevLength, newLength); + } + }); + + return file; + } +} + +export default MmapReadOnlyIndex; diff --git a/src/Index/MmapReadableIndex.js b/src/Index/MmapReadableIndex.js new file mode 100644 index 0000000..fcc64d1 --- /dev/null +++ b/src/Index/MmapReadableIndex.js @@ -0,0 +1,192 @@ +import events from 'events'; +import { ReadableAppendOnlyMmapedFile } from '../File/AppendOnlyMmapedFile.js'; +import Entry, { assertValidEntryClass } from '../IndexEntry.js'; +import { assert, wrapAndCheck, binarySearch } from '../util.js'; + +// Must match the header magic used by the existing index for file-format compatibility. +const HEADER_MAGIC = 'nesidx01'; + +/** + * A memory-mapped index that reads an ordered list of fixed-size entry records directly from a + * mapped buffer, avoiding per-read syscalls and extra copying. + * + * File layout (identical header to the existing file-based index): + * [0..7] 8-byte magic "nesidx01" + * [8..11] uint32BE: metadata JSON byte length (including padding + newline) + * [12..] metadata JSON, space-padded, newline-terminated, aligned to 16 bytes + * [headerSize..fileSize-1] fixed-size entry records, each of EntryClass.size bytes + * + * The file is backed by a WritableAppendOnlyMmapedFile (writable variant) or + * ReadableAppendOnlyMmapedFile (read-only variant), which stores a 4-byte logical-size + * marker at the end of the mapped region so that readers can resolve fileSize without + * scanning. + */ +class MmapReadableIndex extends events.EventEmitter { + + constructor(name = '.index', options = {}) { + super(); + if (typeof name !== 'string') { + options = name; + name = '.index'; + } + options = Object.assign({ dataDirectory: '.', EntryClass: Entry }, options); + assertValidEntryClass(options.EntryClass); + + this.name = name; + this.EntryClass = options.EntryClass; + this.headerSize = 0; + this.metadata = options.metadata + ? Object.assign({ entryClass: options.EntryClass.name, entrySize: options.EntryClass.size }, options.metadata) + : undefined; + + this.file = this.createFile(name, options); + this.initIndex(options); + this.open(); + } + + createFile(name, options) { + return new ReadableAppendOnlyMmapedFile(name, options); + } + + // Protected hook called after createFile() and before open(), so subclasses can + // initialise their own state before the file is opened. + initIndex(options) {} // eslint-disable-line no-unused-vars + + get length() { + if (!this.isOpen() || this.file.fileSize <= this.headerSize) { + return 0; + } + return Math.floor((this.file.fileSize - this.headerSize) / this.EntryClass.size); + } + + get lastEntry() { + const len = this.length; + return len > 0 ? this.get(len) : false; + } + + isOpen() { + return this.file.isOpen(); + } + + open() { + if (this.file.isOpen()) { + return false; + } + this.file.open(); + this.readMetadata(); + return true; + } + + close() { + this.file.close(); + } + + readMetadata() { + assert(this.file.fileSize >= 12, 'Invalid index file!'); + const prefix = this.file.read(0, 12); + const magic = prefix.toString('utf8', 0, 8); + assert(magic.slice(0, 6) === HEADER_MAGIC.slice(0, 6), 'Invalid file header.'); + assert(magic === HEADER_MAGIC, `Invalid file version. The index ${this.file.fileName} was created with a different library version (${magic.slice(6)}).`); + const metadataSize = prefix.readUInt32BE(8); + assert(metadataSize >= 3, 'Invalid metadata size.'); + assert(this.file.fileSize >= 12 + metadataSize, 'Invalid index file!'); + const metadataJson = this.file.read(12, metadataSize).toString('utf8').trim(); + this.verifyAndSetMetadata(metadataJson); + this.headerSize = 12 + metadataSize; + } + + verifyAndSetMetadata(metadata) { + if (this.metadata && JSON.stringify(this.metadata) !== metadata) { + throw new Error('Index metadata mismatch! ' + metadata); + } + try { + this.metadata = JSON.parse(metadata); + } catch (e) { + throw new Error('Invalid metadata.'); + } + } + + /** + * Get a single entry at the given 1-based position. + * + * @api + * @param {number} index 1-based position. + * @returns {Entry|false} + */ + get(index) { + index = wrapAndCheck(index, this.length); + if (index <= 0) { + return false; + } + const offset = this.headerSize + (index - 1) * this.EntryClass.size; + return this.EntryClass.fromBuffer(this.file.read(offset, this.EntryClass.size)); + } + + /** + * Get a range of entries. + * + * @api + * @param {number} from 1-based start position (inclusive). Negative wraps from end. + * @param {number} [until=-1] 1-based end position (inclusive). Negative wraps from end. + * @returns {Array|false} + */ + range(from, until = -1) { + from = wrapAndCheck(from, this.length); + until = wrapAndCheck(until, this.length); + if (from <= 0 || until < from) { + return false; + } + const count = until - from + 1; + const offset = this.headerSize + (from - 1) * this.EntryClass.size; + const buf = this.file.read(offset, count * this.EntryClass.size); + const result = []; + for (let i = 0; i < count; i++) { + result.push(this.EntryClass.fromBuffer(buf, i * this.EntryClass.size)); + } + return result; + } + + /** + * @api + * @returns {Array} + */ + all() { + if (this.length === 0) { + return []; + } + return this.range(1, this.length); + } + + /** + * @api + * @param {number} from 1-based start position. + * @param {number} until 1-based end position. + * @returns {boolean} + */ + validRange(from, until) { + if (from < 1 || from > this.length) { + return false; + } + return (until >= from && until <= this.length); + } + + /** + * Binary-search for the last entry with sequence number <= `number`. + * Pass `min=true` to find the first entry with number >= `number`. + * + * @api + * @param {number} number + * @param {boolean} [min=false] + * @returns {number} 1-based position, or 0 if not found. + */ + find(number, min = false) { + if (this.length < 1) { + return 0; + } + const [low, high] = binarySearch(number, Math.min(this.length, number), index => this.get(index).number); + return min ? low : high; + } +} + +export default MmapReadableIndex; +export { HEADER_MAGIC }; diff --git a/src/Index/MmapWritableIndex.js b/src/Index/MmapWritableIndex.js new file mode 100644 index 0000000..3ef4a41 --- /dev/null +++ b/src/Index/MmapWritableIndex.js @@ -0,0 +1,135 @@ +import fs from 'fs'; +import WritableAppendOnlyMmapedFile from '../File/AppendOnlyMmapedFile.js'; +import MmapReadableIndex, { HEADER_MAGIC } from './MmapReadableIndex.js'; +import Entry from '../IndexEntry.js'; +import { assertEqual } from '../util.js'; +import { buildMetadataHeader } from '../metadataUtil.js'; + +/** + * An append-only, memory-mapped index. + * + * On first creation the metadata header is written as the initial mapped content so that the + * file is immediately readable by MmapReadableIndex after a flush. On subsequent opens the + * header is read back from the mapped buffer and verified. + * + * Entries are appended by writing directly into the mapped region, so there is no separate + * user-space write buffer. A delayed flush (mmap.sync + fdatasync) is scheduled after each + * add() call and can be forced at any time with flush(). + */ +class MmapWritableIndex extends MmapReadableIndex { + + constructor(name = '.index', options = {}) { + if (typeof name !== 'string') { + options = name; + name = '.index'; + } + options = Object.assign({ writeBufferSize: 64 * 1024, flushDelay: 100 }, options); + super(name, options); + } + + createFile(name, options) { + const EntryClass = options.EntryClass || Entry; + const metadata = Object.assign( + { entryClass: EntryClass.name, entrySize: EntryClass.size }, + options.metadata + ); + // The metadata header becomes initialData so that a newly created file already + // contains a valid readable header after the first open(). + const initialData = buildMetadataHeader(HEADER_MAGIC, metadata); + return new WritableAppendOnlyMmapedFile(name, Object.assign({}, options, { initialData })); + } + + initIndex(options) { + this.flushDelay = options.flushDelay || 100; + this.flushTimeout = null; + this.flushCallbacks = []; + } + + close() { + if (this.file.isOpen()) { + this.flush(); + } + this.file.close(); + } + + destroy() { + this.close(); + fs.unlinkSync(this.file.fileName); + } + + /** + * Flush pending mmap data to disk and invoke any registered post-flush callbacks. + * + * @returns {boolean} True if a flush was actually performed. + */ + flush() { + if (!this.file.isOpen()) { + return false; + } + if (this.flushTimeout) { + clearTimeout(this.flushTimeout); + this.flushTimeout = null; + } + const flushed = this.file.flush(); + const callbacks = this.flushCallbacks; + this.flushCallbacks = []; + for (let i = 0; i < callbacks.length; i += 2) { + callbacks[i](callbacks[i + 1]); + } + return flushed; + } + + onFlush(callback, position) { + if (typeof callback !== 'function') { + return; + } + this.flushCallbacks.push(callback, position); + } + + /** + * Append a single entry to the index. + * + * @api + * @param {Entry} entry + * @param {function} [callback] Called with the 1-based entry position after the next flush. + * @returns {number} The 1-based position of the appended entry. + */ + add(entry, callback) { + assertEqual(entry.constructor.name, this.EntryClass.name, 'Wrong entry object.'); + assertEqual(entry.constructor.size, this.EntryClass.size, 'Invalid entry size.'); + + const last = this.lastEntry; + if (last && last.number >= entry.number) { + throw new Error('Consistency error. Tried to add an index that should come before existing last entry.'); + } + + const buf = Buffer.allocUnsafe(this.EntryClass.size); + entry.toBuffer(buf, 0); + this.file.write(buf); + + this.onFlush(callback, this.length); + if (!this.flushTimeout) { + this.flushTimeout = setTimeout(() => this.flush(), this.flushDelay); + } + return this.length; + } + + /** + * Truncate the index so that it contains at most `after` entries. + * + * @param {number} after Number of entries to keep (0 keeps none). + */ + truncate(after) { + if (!this.file.isOpen()) { + return; + } + if (after < 0) { + after = 0; + } + this.flush(); + this.file.truncate(this.headerSize + after * this.EntryClass.size); + } +} + +export default MmapWritableIndex; +export { Entry }; diff --git a/src/MmapIndex.js b/src/MmapIndex.js new file mode 100644 index 0000000..f601d25 --- /dev/null +++ b/src/MmapIndex.js @@ -0,0 +1,8 @@ +import MmapWritableIndex, { Entry } from './Index/MmapWritableIndex.js'; +import MmapReadOnlyIndex from './Index/MmapReadOnlyIndex.js'; + +MmapWritableIndex.ReadOnly = MmapReadOnlyIndex; +MmapWritableIndex.Entry = Entry; + +export default MmapWritableIndex; +export { MmapReadOnlyIndex as ReadOnly, Entry }; diff --git a/test/MmapIndex.spec.js b/test/MmapIndex.spec.js new file mode 100644 index 0000000..ccff1fe --- /dev/null +++ b/test/MmapIndex.spec.js @@ -0,0 +1,200 @@ +import expect from 'expect.js'; +import fs from 'fs-extra'; +import { once } from 'events'; +import { fileURLToPath } from 'url'; +import MmapIndex, { ReadOnly as MmapReadOnlyIndex, Entry as IndexEntry } from '../src/MmapIndex.js'; + +const __dirname = fileURLToPath(new URL('.', import.meta.url)); +const dataDirectory = __dirname + 'data'; + +describe('MmapIndex', function () { + + let index, readers = []; + + beforeEach(function () { + fs.emptyDirSync(dataDirectory); + }); + + afterEach(function () { + if (index) index.close(); + for (const reader of readers) reader.close(); + readers = []; + index = null; + }); + + function createIndex(name = '.mmap.index', options = {}) { + return new MmapIndex(name, Object.assign({ dataDirectory }, options)); + } + + function createReader(name = '.mmap.index', options = {}) { + const reader = new MmapReadOnlyIndex(name, Object.assign({ dataDirectory }, options)); + readers.push(reader); + return reader; + } + + it('is opened on instantiation', function () { + index = createIndex(); + expect(index.isOpen()).to.be(true); + }); + + it('can be opened multiple times without effect', function () { + index = createIndex(); + expect(index.open()).to.be(false); + }); + + it('defaults name to ".index"', function () { + index = new MmapIndex({ dataDirectory }); + expect(index.name).to.be('.index'); + }); + + it('starts with length 0', function () { + index = createIndex(); + expect(index.length).to.be(0); + }); + + it('appends an entry and reports the correct length', function () { + index = createIndex(); + index.add(new IndexEntry(1, 100)); + expect(index.length).to.be(1); + }); + + it('reads back a single appended entry', function () { + index = createIndex(); + index.add(new IndexEntry(1, 42, 16, 0)); + index.flush(); + const entry = index.get(1); + expect(entry.number).to.be(1); + expect(entry.position).to.be(42); + expect(entry.size).to.be(16); + }); + + it('returns false for out-of-range get()', function () { + index = createIndex(); + expect(index.get(0)).to.be(false); + expect(index.get(1)).to.be(false); + }); + + it('returns lastEntry', function () { + index = createIndex(); + expect(index.lastEntry).to.be(false); + index.add(new IndexEntry(3, 200)); + index.flush(); + expect(index.lastEntry.number).to.be(3); + }); + + it('range() returns entries in the given 1-based window', function () { + index = createIndex(); + for (let i = 1; i <= 5; i++) { + index.add(new IndexEntry(i, i * 10)); + } + index.flush(); + const entries = index.range(2, 4); + expect(entries.length).to.be(3); + expect(entries[0].number).to.be(2); + expect(entries[2].number).to.be(4); + }); + + it('all() returns all entries', function () { + index = createIndex(); + for (let i = 1; i <= 3; i++) { + index.add(new IndexEntry(i, i)); + } + index.flush(); + const all = index.all(); + expect(all.length).to.be(3); + }); + + it('find() locates the entry by sequence number', function () { + index = createIndex(); + for (let i = 1; i <= 5; i++) { + index.add(new IndexEntry(i, i * 100)); + } + index.flush(); + expect(index.find(3)).to.be(3); + expect(index.find(6)).to.be(5); // past end → last high + }); + + it('throws on out-of-order add()', function () { + index = createIndex(); + index.add(new IndexEntry(5, 500)); + expect(() => index.add(new IndexEntry(3, 300))).to.throwError(/Consistency error/); + }); + + it('persists entries across close and reopen', function () { + index = createIndex('persist.index'); + for (let i = 1; i <= 4; i++) { + index.add(new IndexEntry(i, i * 10)); + } + index.flush(); + index.close(); + index = null; + + index = createIndex('persist.index'); + expect(index.length).to.be(4); + expect(index.get(4).number).to.be(4); + }); + + it('truncate() removes trailing entries', function () { + index = createIndex(); + for (let i = 1; i <= 5; i++) { + index.add(new IndexEntry(i, i)); + } + index.flush(); + index.truncate(3); + expect(index.length).to.be(3); + expect(index.lastEntry.number).to.be(3); + }); + + it('preserves user metadata across reopen', function () { + index = createIndex('meta.index', { metadata: { stream: 'orders' } }); + expect(index.metadata.stream).to.be('orders'); + index.close(); + index = null; + + index = createIndex('meta.index'); + expect(index.metadata.stream).to.be('orders'); + }); + + it('throws on metadata mismatch', function () { + createIndex('meta.index', { metadata: { stream: 'a' } }).close(); + expect(() => createIndex('meta.index', { metadata: { stream: 'b' } })).to.throwError(/metadata mismatch/); + }); + + it('MmapReadOnlyIndex emits append when writer flushes new entries', function (done) { + index = createIndex('watch.index'); + index.flush(); + + const reader = createReader('watch.index'); + once(reader, 'append').then(([prevLen, newLen]) => { + expect(prevLen).to.be(0); + expect(newLen).to.be(2); + expect(reader.get(1).number).to.be(1); + expect(reader.get(2).number).to.be(2); + done(); + }).catch(done); + + index.add(new IndexEntry(1, 10)); + index.add(new IndexEntry(2, 20)); + index.flush(); + }); + + it('MmapReadOnlyIndex emits truncate when writer truncates', function (done) { + index = createIndex('trunc.index'); + for (let i = 1; i <= 3; i++) { + index.add(new IndexEntry(i, i)); + } + index.flush(); + + const reader = createReader('trunc.index'); + expect(reader.length).to.be(3); + + once(reader, 'truncate').then(([prevLen, newLen]) => { + expect(prevLen).to.be(3); + expect(newLen).to.be(1); + done(); + }).catch(done); + + index.truncate(1); + index.flush(); + }); +}); From cec0c3930b3fdf5390fd2ee3f1b304fc345ca48e Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 17:51:29 +0000 Subject: [PATCH 07/23] Address code review: remove redundant isOpen guard in close(), drop eslint-disable comment Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/2d421c70-53fb-4e29-a82f-e3da3bb18748 Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- src/Index/MmapReadableIndex.js | 2 +- src/Index/MmapWritableIndex.js | 4 +--- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/src/Index/MmapReadableIndex.js b/src/Index/MmapReadableIndex.js index fcc64d1..91d0774 100644 --- a/src/Index/MmapReadableIndex.js +++ b/src/Index/MmapReadableIndex.js @@ -50,7 +50,7 @@ class MmapReadableIndex extends events.EventEmitter { // Protected hook called after createFile() and before open(), so subclasses can // initialise their own state before the file is opened. - initIndex(options) {} // eslint-disable-line no-unused-vars + initIndex(options) {} get length() { if (!this.isOpen() || this.file.fileSize <= this.headerSize) { diff --git a/src/Index/MmapWritableIndex.js b/src/Index/MmapWritableIndex.js index 3ef4a41..50bb38f 100644 --- a/src/Index/MmapWritableIndex.js +++ b/src/Index/MmapWritableIndex.js @@ -46,9 +46,7 @@ class MmapWritableIndex extends MmapReadableIndex { } close() { - if (this.file.isOpen()) { - this.flush(); - } + this.flush(); this.file.close(); } From 291d47b60d012c150e68583fbc9ce064a73d6d8a Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 18:12:17 +0000 Subject: [PATCH 08/23] planning: file.write(size) API + bench + caching Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/7186038b-70be-4b9d-b1b4-ccfca898a7aa Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- bench/package-lock.json | 2945 ++++++++++++++++++++++++++++++++++++++- bench/package.json | 4 +- 2 files changed, 2919 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b/bench/package.json index 89e5282..e6443ed 100644 --- a/bench/package.json +++ b/bench/package.json @@ -6,9 +6,11 @@ "bench": "node bench-index.js && node bench-storage.js && node bench-eventstore.js && node bench-read-scenarios.js" }, "dependencies": { + "@riaskov/mmap-io": "^1.4.3", "beautify-benchmark": "^0.2.4", "benchmark": "^2.1.4", "event-storage": "^0.7.2", - "fs-extra": "^11.1.1" + "fs-extra": "^11.1.1", + "mkdirp": "^3.0.1" } } From bb1cff3f4b92a6e4ce714dd1549aa61b3adaac28 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 18:26:49 +0000 Subject: [PATCH 09/23] Add write(size) API, entry caching, hasPendingData flush guard, and MmapIndex bench Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/7186038b-70be-4b9d-b1b4-ccfca898a7aa Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- bench/bench-index.js | 7 ++++++- src/File/AppendOnlyMmapedFile.js | 31 +++++++++++++++++++++++++++-- src/Index/MmapReadableIndex.js | 34 +++++++++++++++++++++++++------- src/Index/MmapWritableIndex.js | 6 +++--- 4 files changed, 65 insertions(+), 13 deletions(-) diff --git a/bench/bench-index.js b/bench/bench-index.js index 9763811..3616e96 100644 --- a/bench/bench-index.js +++ b/bench/bench-index.js @@ -2,7 +2,7 @@ import Benchmark from 'benchmark'; import benchmarks from 'beautify-benchmark'; import fs from 'fs-extra'; import Stable from 'event-storage'; -import { Index as LatestIndex } from '../index.js'; +import { Index as LatestIndex, MmapIndex } from '../index.js'; const Suite = new Benchmark.Suite('index'); Suite.on('start', () => fs.emptyDirSync('data')); @@ -13,6 +13,7 @@ Suite.on('error', (e) => console.log(e.target.error)); const WRITES = 1000; let stableCallCount = 0; let latestCallCount = 0; +let mmapCallCount = 0; function bench(index) { index.open(); @@ -38,4 +39,8 @@ Suite.add('index [latest]', function() { bench(new LatestIndex((latestCallCount++) + '.index', { dataDirectory: 'data/latest' })); }); +Suite.add('index [mmap]', function() { + bench(new MmapIndex((mmapCallCount++) + '.index', { dataDirectory: 'data/mmap' })); +}); + Suite.run(); \ No newline at end of file diff --git a/src/File/AppendOnlyMmapedFile.js b/src/File/AppendOnlyMmapedFile.js index aab2283..e49cae5 100644 --- a/src/File/AppendOnlyMmapedFile.js +++ b/src/File/AppendOnlyMmapedFile.js @@ -99,6 +99,7 @@ class ReadableAppendOnlyMmapedFile extends events.EventEmitter { this.unmap(); this.map(stat.size); const markedSize = this.readFileSizeMarker(); + this.markerWasInvalid = markedSize < 0; this.fileSize = markedSize >= 0 ? markedSize : this.detectFileSize(); } @@ -123,6 +124,7 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { this.pageSize = mmap.PAGESIZE; this.writeBufferSize = Math.max(this.pageSize, options.writeBufferSize || DEFAULT_WRITE_BUFFER_SIZE); this.initialData = options.initialData ? Buffer.from(options.initialData) : null; + this.hasPendingData = false; } writeFileSizeMarker() { @@ -137,10 +139,14 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { if (!this.fd || !this.mapBuffer) { return false; } + if (!this.hasPendingData) { + return false; + } mmap.sync(this.mapBuffer, true); const now = new Date(); fs.futimesSync(this.fd, now, now); fs.fdatasyncSync(this.fd); + this.hasPendingData = false; return true; } @@ -153,6 +159,7 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { this.mapBuffer.fill(0, size, this.fileSize); this.fileSize = size; this.writeFileSizeMarker(); + this.hasPendingData = true; return true; } @@ -171,6 +178,7 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { this.initialData.copy(this.mapBuffer, 0); } this.writeFileSizeMarker(); + this.hasPendingData = true; this.flush(); } @@ -197,9 +205,12 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { const wantedMappedSize = this.computeMappedSize(this.fileSize); if (this.mappedSize < wantedMappedSize) { this.grow(this.fileSize); + } else if (this.markerWasInvalid) { + // Crash-recovery: the marker was missing or corrupt; re-write and flush it. + this.writeFileSizeMarker(); + this.hasPendingData = true; + this.flush(); } - this.writeFileSizeMarker(); - this.flush(); return true; } @@ -214,11 +225,26 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { this.map(nextMappedSize); this.fileSize = requiredFileSize; this.writeFileSizeMarker(); + this.hasPendingData = true; return true; } write(data) { assert(this.mapBuffer !== null, 'File is not mapped.'); + if (typeof data === 'number') { + // Reserve `data` bytes at the current write position and return the mapped slice + // so callers can serialise directly into the mmap buffer with no extra copy. + const size = data; + const writePosition = this.fileSize; + const endPosition = writePosition + size; + if (endPosition > this.mappedSize - FILE_SIZE_MARKER_SIZE) { + this.grow(endPosition); + } + this.fileSize = endPosition; + this.writeFileSizeMarker(); + this.hasPendingData = true; + return this.mapBuffer.subarray(writePosition, endPosition); + } const buffer = Buffer.isBuffer(data) ? data : Buffer.from(data); const writePosition = this.fileSize; const endPosition = writePosition + buffer.byteLength; @@ -228,6 +254,7 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { buffer.copy(this.mapBuffer, writePosition); this.fileSize = endPosition; this.writeFileSizeMarker(); + this.hasPendingData = true; return writePosition; } diff --git a/src/Index/MmapReadableIndex.js b/src/Index/MmapReadableIndex.js index 91d0774..993f2a2 100644 --- a/src/Index/MmapReadableIndex.js +++ b/src/Index/MmapReadableIndex.js @@ -35,6 +35,7 @@ class MmapReadableIndex extends events.EventEmitter { this.name = name; this.EntryClass = options.EntryClass; this.headerSize = 0; + this.data = []; this.metadata = options.metadata ? Object.assign({ entryClass: options.EntryClass.name, entrySize: options.EntryClass.size }, options.metadata) : undefined; @@ -72,12 +73,14 @@ class MmapReadableIndex extends events.EventEmitter { if (this.file.isOpen()) { return false; } + this.data = []; this.file.open(); this.readMetadata(); return true; } close() { + this.data = []; this.file.close(); } @@ -118,8 +121,13 @@ class MmapReadableIndex extends events.EventEmitter { if (index <= 0) { return false; } + if (this.data[index - 1]) { + return this.data[index - 1]; + } const offset = this.headerSize + (index - 1) * this.EntryClass.size; - return this.EntryClass.fromBuffer(this.file.read(offset, this.EntryClass.size)); + const entry = this.EntryClass.fromBuffer(this.file.read(offset, this.EntryClass.size)); + this.data[index - 1] = entry; + return entry; } /** @@ -137,13 +145,25 @@ class MmapReadableIndex extends events.EventEmitter { return false; } const count = until - from + 1; - const offset = this.headerSize + (from - 1) * this.EntryClass.size; - const buf = this.file.read(offset, count * this.EntryClass.size); - const result = []; - for (let i = 0; i < count; i++) { - result.push(this.EntryClass.fromBuffer(buf, i * this.EntryClass.size)); + + // Determine the contiguous uncached region to batch-read. + let readFrom = from; + let readUntil = until; + while (readUntil >= readFrom && this.data[readUntil - 1]) { + readUntil--; } - return result; + + if (readFrom <= readUntil) { + const readCount = readUntil - readFrom + 1; + const offset = this.headerSize + (readFrom - 1) * this.EntryClass.size; + const buf = this.file.read(offset, readCount * this.EntryClass.size); + for (let i = 0; i < readCount; i++) { + const entry = this.EntryClass.fromBuffer(buf, i * this.EntryClass.size); + this.data[readFrom - 1 + i] = entry; + } + } + + return this.data.slice(from - 1, until); } /** diff --git a/src/Index/MmapWritableIndex.js b/src/Index/MmapWritableIndex.js index 50bb38f..f12f95f 100644 --- a/src/Index/MmapWritableIndex.js +++ b/src/Index/MmapWritableIndex.js @@ -101,9 +101,8 @@ class MmapWritableIndex extends MmapReadableIndex { throw new Error('Consistency error. Tried to add an index that should come before existing last entry.'); } - const buf = Buffer.allocUnsafe(this.EntryClass.size); - entry.toBuffer(buf, 0); - this.file.write(buf); + entry.toBuffer(this.file.write(this.EntryClass.size), 0); + this.data[this.length - 1] = entry; this.onFlush(callback, this.length); if (!this.flushTimeout) { @@ -126,6 +125,7 @@ class MmapWritableIndex extends MmapReadableIndex { } this.flush(); this.file.truncate(this.headerSize + after * this.EntryClass.size); + this.data.splice(after); } } From f9516f6d6ca944c4c2475975eefe913a1d1d15ce Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 18:29:30 +0000 Subject: [PATCH 10/23] Split write(data) and reserve(size), add cache forward-trim, clear markerWasInvalid after recovery Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/7186038b-70be-4b9d-b1b4-ccfca898a7aa Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- src/File/AppendOnlyMmapedFile.js | 37 ++++++++++++++++++++------------ src/Index/MmapReadableIndex.js | 5 ++++- src/Index/MmapWritableIndex.js | 2 +- 3 files changed, 28 insertions(+), 16 deletions(-) diff --git a/src/File/AppendOnlyMmapedFile.js b/src/File/AppendOnlyMmapedFile.js index e49cae5..3f55980 100644 --- a/src/File/AppendOnlyMmapedFile.js +++ b/src/File/AppendOnlyMmapedFile.js @@ -207,6 +207,7 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { this.grow(this.fileSize); } else if (this.markerWasInvalid) { // Crash-recovery: the marker was missing or corrupt; re-write and flush it. + this.markerWasInvalid = false; this.writeFileSizeMarker(); this.hasPendingData = true; this.flush(); @@ -231,20 +232,6 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { write(data) { assert(this.mapBuffer !== null, 'File is not mapped.'); - if (typeof data === 'number') { - // Reserve `data` bytes at the current write position and return the mapped slice - // so callers can serialise directly into the mmap buffer with no extra copy. - const size = data; - const writePosition = this.fileSize; - const endPosition = writePosition + size; - if (endPosition > this.mappedSize - FILE_SIZE_MARKER_SIZE) { - this.grow(endPosition); - } - this.fileSize = endPosition; - this.writeFileSizeMarker(); - this.hasPendingData = true; - return this.mapBuffer.subarray(writePosition, endPosition); - } const buffer = Buffer.isBuffer(data) ? data : Buffer.from(data); const writePosition = this.fileSize; const endPosition = writePosition + buffer.byteLength; @@ -258,6 +245,28 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { return writePosition; } + /** + * Reserve `size` bytes at the current write position and return the mapped + * buffer slice, allowing callers to serialise directly into the mmap region + * with no extra copy. Equivalent to `write(Buffer.allocUnsafe(size))` but + * without the intermediate allocation. + * + * @param {number} size Number of bytes to reserve. + * @returns {Buffer} A view into the mmap buffer at the reserved region. + */ + reserve(size) { + assert(this.mapBuffer !== null, 'File is not mapped.'); + const writePosition = this.fileSize; + const endPosition = writePosition + size; + if (endPosition > this.mappedSize - FILE_SIZE_MARKER_SIZE) { + this.grow(endPosition); + } + this.fileSize = endPosition; + this.writeFileSizeMarker(); + this.hasPendingData = true; + return this.mapBuffer.subarray(writePosition, endPosition); + } + close() { this.flush(); super.close(); diff --git a/src/Index/MmapReadableIndex.js b/src/Index/MmapReadableIndex.js index 993f2a2..9b4a096 100644 --- a/src/Index/MmapReadableIndex.js +++ b/src/Index/MmapReadableIndex.js @@ -146,8 +146,11 @@ class MmapReadableIndex extends events.EventEmitter { } const count = until - from + 1; - // Determine the contiguous uncached region to batch-read. + // Trim the range to skip entries that are already cached at both ends. let readFrom = from; + while (readFrom <= until && this.data[readFrom - 1]) { + readFrom++; + } let readUntil = until; while (readUntil >= readFrom && this.data[readUntil - 1]) { readUntil--; diff --git a/src/Index/MmapWritableIndex.js b/src/Index/MmapWritableIndex.js index f12f95f..e706cf1 100644 --- a/src/Index/MmapWritableIndex.js +++ b/src/Index/MmapWritableIndex.js @@ -101,7 +101,7 @@ class MmapWritableIndex extends MmapReadableIndex { throw new Error('Consistency error. Tried to add an index that should come before existing last entry.'); } - entry.toBuffer(this.file.write(this.EntryClass.size), 0); + entry.toBuffer(this.file.reserve(this.EntryClass.size), 0); this.data[this.length - 1] = entry; this.onFlush(callback, this.length); From dabe4ffc9fe186c182650bac8e7252774255a391 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 18:42:07 +0000 Subject: [PATCH 11/23] Refactor index benchmark to shared writer/readers with scaling steps Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/4ec39e45-f06c-48a1-8c2e-d9e1a1ca67e0 Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- bench/bench-index.js | 84 ++++++++++++++++++++++++++++++-------------- 1 file changed, 58 insertions(+), 26 deletions(-) diff --git a/bench/bench-index.js b/bench/bench-index.js index 3616e96..be0db38 100644 --- a/bench/bench-index.js +++ b/bench/bench-index.js @@ -11,36 +11,68 @@ Suite.on('complete', () => benchmarks.log()); Suite.on('error', (e) => console.log(e.target.error)); const WRITES = 1000; -let stableCallCount = 0; -let latestCallCount = 0; -let mmapCallCount = 0; - -function bench(index) { - index.open(); - for (let i = 1; i<=WRITES; i++) { - index.add(new Stable.Index.Entry(i,2,4,8)); +const READER_STEPS = [1, 2, 4, 8, 16]; + +function bench({ IndexClass, dataDirectory, id, readers }) { + const name = `${id}.index`; + const writer = new IndexClass(name, { dataDirectory }); + const readIndexes = []; + const ReaderClass = IndexClass.ReadOnly || IndexClass; + + for (let reader = 0; reader < readers; reader++) { + const readIndex = new ReaderClass(name, { dataDirectory }); + if (typeof readIndex.range !== 'function') { + readIndexes.push(new IndexClass(name, { dataDirectory })); + continue; + } + readIndexes.push(readIndex); } - index.close(); - let number; - index.open(); - for (let entry of index.range(-WRITES + 1)) { - number = entry.number; + writer.open(); + for (const index of readIndexes) { + index.open(); } - index.close(); - if (number < WRITES) throw new Error('Not all entries were written! Last entry was '+number); -} -Suite.add('index [stable]', function() { - bench(new Stable.Index((stableCallCount++) + '.index', { dataDirectory: 'data/stable' })); -}); + for (let i = 1; i <= WRITES; i++) { + writer.add(new IndexClass.Entry(i, 2, 4, 8)); + } + writer.flush(); + + for (const index of readIndexes) { + index.close(); + index.open(); + let number = 0; + const entries = index.range(-WRITES + 1) || []; + for (const entry of entries) { + number = entry.number; + } + if (number < WRITES) { + throw new Error('Not all entries were written! Last entry was ' + number); + } + } -Suite.add('index [latest]', function() { - bench(new LatestIndex((latestCallCount++) + '.index', { dataDirectory: 'data/latest' })); -}); + for (const index of readIndexes) { + index.close(); + } + writer.close(); +} + +function addBenchmarks(label, IndexClass, dataDirectory) { + let callCount = 0; + for (const readers of READER_STEPS) { + Suite.add(`index [${label}] readers=${readers}`, function() { + bench({ + IndexClass, + dataDirectory, + id: callCount++, + readers + }); + }); + } +} -Suite.add('index [mmap]', function() { - bench(new MmapIndex((mmapCallCount++) + '.index', { dataDirectory: 'data/mmap' })); -}); +addBenchmarks('stable', Stable.Index, 'data/stable'); +addBenchmarks('latest', LatestIndex, 'data/latest'); +addBenchmarks('mmap', MmapIndex, 'data/mmap'); -Suite.run(); \ No newline at end of file +Suite.run(); From 6c9df21a3c369e72f7ac309d8a24a4b9c125a703 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 19:01:28 +0000 Subject: [PATCH 12/23] Split benchmark read ranges across readers Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/5c6d97e6-c668-48d1-9524-b8de094b6ebb Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- bench/bench-index.js | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/bench/bench-index.js b/bench/bench-index.js index be0db38..aa592be 100644 --- a/bench/bench-index.js +++ b/bench/bench-index.js @@ -41,13 +41,24 @@ function bench({ IndexClass, dataDirectory, id, readers }) { for (const index of readIndexes) { index.close(); index.open(); + } + + for (let reader = 0; reader < readIndexes.length; reader++) { + const index = readIndexes[reader]; + const start = Math.floor((reader * WRITES) / readers) + 1; + const end = Math.floor(((reader + 1) * WRITES) / readers); + const expectedLength = end - start + 1; let number = 0; - const entries = index.range(-WRITES + 1) || []; + const entries = index.range(start, end) || []; for (const entry of entries) { number = entry.number; } - if (number < WRITES) { - throw new Error('Not all entries were written! Last entry was ' + number); + if (entries.length !== expectedLength || number !== end) { + throw new Error( + 'Split read range failed for reader ' + reader + + ': expected [' + start + ',' + end + '] but got last=' + number + + ' length=' + entries.length + ); } } From 1725a082cf103fd5cfb5fb1b413761fbfaad2b73 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 19:09:40 +0000 Subject: [PATCH 13/23] Implement mmap partition classes and benchmark updates Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/cd6720f9-1d0f-4808-bfd1-718ce582889c Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- bench/bench-storage.js | 61 ++++++-- index.js | 1 + package.json | 1 + src/MmapPartition.js | 8 + src/Partition/MmapReadOnlyPartition.js | 33 +++++ src/Partition/MmapReadablePartition.js | 145 ++++++++++++++++++ src/Partition/MmapWritablePartition.js | 194 +++++++++++++++++++++++++ test/MmapPartition.spec.js | 58 ++++++++ 8 files changed, 486 insertions(+), 15 deletions(-) create mode 100644 src/MmapPartition.js create mode 100644 src/Partition/MmapReadOnlyPartition.js create mode 100644 src/Partition/MmapReadablePartition.js create mode 100644 src/Partition/MmapWritablePartition.js create mode 100644 test/MmapPartition.spec.js diff --git a/bench/bench-storage.js b/bench/bench-storage.js index 4757b3d..b5ea514 100644 --- a/bench/bench-storage.js +++ b/bench/bench-storage.js @@ -3,6 +3,8 @@ import benchmarks from 'beautify-benchmark'; import fs from 'fs-extra'; import Stable from 'event-storage'; import { Storage as LatestStorage } from '../index.js'; +import MmapWritableIndex from '../src/Index/MmapWritableIndex.js'; +import MmapWritablePartition from '../src/Partition/MmapWritablePartition.js'; const Suite = new Benchmark.Suite('storage'); Suite.on('start', () => fs.emptyDirSync('data')); @@ -11,31 +13,60 @@ Suite.on('complete', () => benchmarks.log()); Suite.on('error', (e) => console.log(e.target.error)); const WRITES = 1000; +const READER_STEPS = [1, 2, 4, 8, 16]; -function bench(storage) { +class MmapStorage extends LatestStorage { + createIndex(name, options = {}) { + return { index: new MmapWritableIndex(name, options) }; + } + + createPartition(name, options = {}) { + return new MmapWritablePartition(name, options); + } +} + +function bench(storage, readers) { storage.open(); - let firstPosition = Number.MAX_SAFE_INTEGER; - const doc = { doc: 'this is some test document for measuring performance', value: 123.45, amount: 999, pad: ' '.repeat(32) }; + const doc = { doc: 'this is some test document for measuring performance', value: 123.45, amount: 999, pad: ' '.repeat(32), seq: 0 }; for (let i = 1; i<=WRITES; i++) { - firstPosition = Math.min(firstPosition, storage.write(doc)); + doc.seq = i; + storage.write(doc); } storage.close(); - let number = 0; storage.open(); - for (let doc of storage.readRange(firstPosition)) { - number++; + for (let reader = 0; reader < readers; reader++) { + const start = Math.floor((reader * WRITES) / readers) + 1; + const end = Math.floor(((reader + 1) * WRITES) / readers); + const expectedLength = end - start + 1; + let number = 0; + let seq = 0; + for (let readDoc of storage.readRange(start, end)) { + number++; + seq = readDoc.seq; + } + if (number !== expectedLength || seq !== end) { + throw new Error( + 'Split read range failed for reader ' + reader + + ': expected [' + start + ',' + end + '] but got last=' + seq + + ' length=' + number + ); + } } storage.close(); - if (number < WRITES) throw new Error('Not all documents were written! Last document was '+number); } -Suite.add('storage [stable]', function() { - bench(new Stable.Storage('storage-' + this.cycles, { dataDirectory: 'data/stable' })); -}); +function addBenchmarks(label, createStorage) { + let callCount = 0; + for (const readers of READER_STEPS) { + Suite.add(`storage [${label}] readers=${readers}`, function() { + bench(createStorage(callCount++), readers); + }); + } +} -Suite.add('storage [latest]', function() { - bench(new LatestStorage('storage-' + this.cycles, { dataDirectory: 'data/latest' })); -}); +addBenchmarks('stable', (id) => new Stable.Storage('storage-' + id, { dataDirectory: 'data/stable' })); +addBenchmarks('latest', (id) => new LatestStorage('storage-' + id, { dataDirectory: 'data/latest' })); +addBenchmarks('mmap', (id) => new MmapStorage('storage-' + id, { dataDirectory: 'data/mmap' })); -Suite.run(); \ No newline at end of file +Suite.run(); diff --git a/index.js b/index.js index cf6bf03..c7adc00 100644 --- a/index.js +++ b/index.js @@ -5,3 +5,4 @@ export { default as Index } from './src/Index.js'; export { default as Consumer } from './src/Consumer.js'; export { default as AppendOnlyMmapedFile } from './src/AppendOnlyMmapedFile.js'; export { default as MmapIndex } from './src/MmapIndex.js'; +export { default as MmapPartition } from './src/MmapPartition.js'; diff --git a/package.json b/package.json index a328758..4866f99 100644 --- a/package.json +++ b/package.json @@ -48,6 +48,7 @@ "src/metadataUtil.js", "src/AppendOnlyMmapedFile.js", "src/MmapIndex*.js", + "src/MmapPartition*.js", "src/File/*.js", "index.js" ], diff --git a/src/MmapPartition.js b/src/MmapPartition.js new file mode 100644 index 0000000..560c8eb --- /dev/null +++ b/src/MmapPartition.js @@ -0,0 +1,8 @@ +import MmapWritablePartition, { CorruptFileError } from './Partition/MmapWritablePartition.js'; +import MmapReadOnlyPartition from './Partition/MmapReadOnlyPartition.js'; + +MmapWritablePartition.ReadOnly = MmapReadOnlyPartition; +MmapWritablePartition.CorruptFileError = CorruptFileError; + +export default MmapWritablePartition; +export { MmapReadOnlyPartition as ReadOnly, CorruptFileError }; diff --git a/src/Partition/MmapReadOnlyPartition.js b/src/Partition/MmapReadOnlyPartition.js new file mode 100644 index 0000000..574da6b --- /dev/null +++ b/src/Partition/MmapReadOnlyPartition.js @@ -0,0 +1,33 @@ +import { ReadOnlyAppendOnlyMmapedFile } from '../File/AppendOnlyMmapedFile.js'; +import MmapReadablePartition from './MmapReadablePartition.js'; + +class MmapReadOnlyPartition extends MmapReadablePartition { + + createFile(name, config) { + const file = new ReadOnlyAppendOnlyMmapedFile(name, config); + + file.on('append', (prevFileSize, newFileSize) => { + const prevSize = Math.max(0, prevFileSize - this.headerSize); + const nextSize = Math.max(0, newFileSize - this.headerSize); + if (nextSize > prevSize) { + this.size = nextSize; + this.emit('append', prevSize, nextSize); + } + }); + + file.on('truncate', (prevFileSize, newFileSize) => { + const prevSize = Math.max(0, prevFileSize - this.headerSize); + const nextSize = Math.max(0, newFileSize - this.headerSize); + if (nextSize < prevSize) { + this.size = nextSize; + this.emit('truncate', prevSize, nextSize); + } + }); + + file.on('rename', () => this.close()); + + return file; + } +} + +export default MmapReadOnlyPartition; diff --git a/src/Partition/MmapReadablePartition.js b/src/Partition/MmapReadablePartition.js new file mode 100644 index 0000000..dd8515d --- /dev/null +++ b/src/Partition/MmapReadablePartition.js @@ -0,0 +1,145 @@ +import { ReadableAppendOnlyMmapedFile } from '../File/AppendOnlyMmapedFile.js'; +import ReadablePartition, { + CorruptFileError, + InvalidDataSizeError, + HEADER_MAGIC, + DOCUMENT_ALIGNMENT, + DOCUMENT_HEADER_SIZE, + DOCUMENT_FOOTER_SIZE +} from './ReadablePartition.js'; +import { assert } from '../util.js'; + +const NES_EPOCH = new Date('2020-01-01T00:00:00'); + +class MmapReadablePartition extends ReadablePartition { + + constructor(name, config = {}) { + super(name, config); + this.file = this.createFile(name, config); + } + + createFile(name, config) { + return new ReadableAppendOnlyMmapedFile(name, config); + } + + isOpen() { + return this.file.isOpen(); + } + + open() { + if (this.file.isOpen()) { + return true; + } + + this.file.open(); + this.fd = this.file.fd; + + this.readBuffer = Buffer.allocUnsafeSlow(this.readBufferSize); + this.readBufferPos = -1; + this.readBufferLength = 0; + + this.headerSize = 0; + this.size = this.readFileSize(); + if (this.size <= 0) { + this.close(); + return false; + } + + this.size -= this.readMetadata(); + return true; + } + + readMetadata() { + assert(this.size >= 16, 'Invalid file.'); + + const headerBuffer = this.file.read(0, 8 + 4); + const headerMagic = headerBuffer.toString('utf8', 0, 8); + assert(headerMagic.substr(0, 6) === HEADER_MAGIC.substr(0, 6), `Invalid file header in partition ${this.name}.`); + + this.header = headerMagic; + assert( + headerMagic === HEADER_MAGIC, + `Invalid file version. The partition ${this.name} was created with a different library version (${headerMagic.substr(6)}).` + ); + + const metadataSize = headerBuffer.readUInt32BE(8); + assert(metadataSize > 2 && metadataSize <= 4096, 'Invalid metadata size.'); + assert(this.file.fileSize >= 12 + metadataSize, 'Invalid file.'); + + const metadata = this.file.readString(12, metadataSize).trim(); + try { + this.metadata = JSON.parse(metadata); + this.metadata.epoch = this.metadata.epoch || NES_EPOCH.getTime(); + } catch (e) { + throw new Error('Invalid metadata.'); + } + + this.headerSize = 12 + metadataSize; + return this.headerSize; + } + + readFileSize() { + return this.file.fileSize - this.headerSize; + } + + close() { + this.file.close(); + this.fd = null; + if (this.readBuffer) { + this.readBuffer = null; + this.readBufferPos = -1; + this.readBufferLength = 0; + } + } + + fillBuffer(from = 0) { + const available = Math.max(0, Math.min(this.readBuffer.byteLength, this.size - from)); + if (available === 0) { + this.readBufferLength = 0; + this.readBufferPos = from; + return; + } + const source = this.file.read(this.headerSize + from, available); + source.copy(this.readBuffer, 0, 0, available); + this.readBufferLength = available; + this.readBufferPos = from; + } + + readFrom(position, size = 0, headerOut = null) { + assert(this.fd, 'Partition is not opened.'); + assert((position % DOCUMENT_ALIGNMENT) === 0, `Invalid read position ${position}. Needs to be a multiple of ${DOCUMENT_ALIGNMENT}.`); + + const reader = this.prepareReadBuffer(position); + if (reader.length < size + DOCUMENT_HEADER_SIZE) { + return false; + } + + let dataPosition = reader.cursor + DOCUMENT_HEADER_SIZE; + const { dataSize, sequenceNumber, time64 } = this.readDocumentHeader(reader.buffer, reader.cursor, position, size); + if (headerOut !== null) { + headerOut.dataSize = dataSize; + headerOut.sequenceNumber = sequenceNumber; + headerOut.time64 = time64; + } + + const writeSize = this.documentWriteSize(dataSize); + if (position + writeSize > this.size) { + throw new CorruptFileError(`Invalid document at position ${position}. This may be caused by an unfinished write.`); + } + + if (dataSize + DOCUMENT_HEADER_SIZE > reader.buffer.byteLength) { + const absoluteDataPosition = this.headerSize + position + DOCUMENT_HEADER_SIZE; + return this.file.readString(absoluteDataPosition, dataSize); + } + + if (reader.cursor > 0 && dataPosition + dataSize > reader.length) { + this.fillBuffer(position); + dataPosition = DOCUMENT_HEADER_SIZE; + } + + return reader.buffer.toString('utf8', dataPosition, dataPosition + dataSize); + } +} + +export default MmapReadablePartition; +export { CorruptFileError, InvalidDataSizeError, HEADER_MAGIC, DOCUMENT_ALIGNMENT, DOCUMENT_HEADER_SIZE, DOCUMENT_FOOTER_SIZE }; diff --git a/src/Partition/MmapWritablePartition.js b/src/Partition/MmapWritablePartition.js new file mode 100644 index 0000000..d6e6463 --- /dev/null +++ b/src/Partition/MmapWritablePartition.js @@ -0,0 +1,194 @@ +import WritableAppendOnlyMmapedFile from '../File/AppendOnlyMmapedFile.js'; +import MmapReadablePartition, { + CorruptFileError, + HEADER_MAGIC, + DOCUMENT_ALIGNMENT, + DOCUMENT_SEPARATOR, + DOCUMENT_HEADER_SIZE, + DOCUMENT_FOOTER_SIZE +} from './MmapReadablePartition.js'; +import { buildMetadataHeader } from '../metadataUtil.js'; +import Clock from '../Clock.js'; +import { assert, alignTo } from '../util.js'; + +const DOCUMENT_PAD = ' '.repeat(DOCUMENT_ALIGNMENT); + +class MmapWritablePartition extends MmapReadablePartition { + + constructor(name, config = {}) { + const defaults = { + writeBufferSize: 64 * 1024, + syncOnFlush: false, + metadata: { + epoch: Date.now() + }, + clock: Clock, + flushDelay: 0 + }; + config.metadata = Object.assign(defaults.metadata, config.metadata); + config = Object.assign(defaults, config); + super(name, config); + + this.syncOnFlush = !!config.syncOnFlush; + this.flushDelay = config.flushDelay >>> 0; // jshint ignore:line + assert(typeof(config.clock.prototype) === 'object' && typeof(config.clock.prototype.time) === 'function', 'Clock needs to implement the method time()'); + this.ClockConstructor = config.clock; + } + + createFile(name, config) { + const metadataHeader = buildMetadataHeader(HEADER_MAGIC, config.metadata); + return new WritableAppendOnlyMmapedFile(name, Object.assign({}, config, { initialData: metadataHeader })); + } + + open() { + if (this.file.isOpen()) { + return true; + } + const opened = super.open(); + if (!opened) { + return false; + } + + this.flushCallbacks = []; + this.flushTimeout = null; + this.clock = new this.ClockConstructor(this.metadata.epoch); + return true; + } + + close() { + this.flush(); + super.close(); + } + + flush() { + if (!this.file.isOpen()) { + return false; + } + if (this.flushTimeout) { + clearTimeout(this.flushTimeout); + this.flushTimeout = null; + } + + const flushed = this.file.flush(); + if (!flushed) { + return false; + } + + if (this.syncOnFlush && this.fd) { + this.file.flush(); + } + + const callbacks = this.flushCallbacks; + this.flushCallbacks = []; + for (let i = 0; i < callbacks.length; i++) { + callbacks[i](); + } + return true; + } + + writeDocumentHeader(buffer, offset, dataSize, sequenceNumber = null, time64 = null) { + if (sequenceNumber === null) { + sequenceNumber = 0; + } + if (time64 === null) { + time64 = this.clock.time(); + } + if (time64 < 0) { + throw new Error('Time may not be negative!'); + } + buffer.writeUInt32BE(dataSize, offset); + buffer.writeUInt32BE(sequenceNumber, offset + 4); + buffer.writeDoubleBE(time64, offset + 8); + return DOCUMENT_HEADER_SIZE; + } + + scheduleFlush() { + if (this.flushTimeout) { + return; + } + this.flushTimeout = setTimeout(() => this.flush(), this.flushDelay); + } + + write(data, sequenceNumber, callback) { + assert(this.fd, 'Partition is not opened.'); + if (typeof sequenceNumber === 'function') { + callback = sequenceNumber; + sequenceNumber = null; + } + const dataSize = Buffer.byteLength(data, 'utf8'); + assert(dataSize <= 64 * 1024 * 1024, 'Document is too large! Maximum is 64 MB'); + + const dataPosition = this.size; + const bytesToWrite = this.documentWriteSize(dataSize); + const target = this.file.reserve(bytesToWrite); + + let bytesWritten = 0; + bytesWritten += this.writeDocumentHeader(target, bytesWritten, dataSize, sequenceNumber); + bytesWritten += target.write(data, bytesWritten, 'utf8'); + const padSize = alignTo(dataSize + DOCUMENT_FOOTER_SIZE, DOCUMENT_ALIGNMENT); + bytesWritten += target.write(DOCUMENT_PAD.substr(0, padSize), bytesWritten, 'utf8'); + target.writeUInt32BE(dataSize, bytesWritten); + bytesWritten += 4; + bytesWritten += target.write(DOCUMENT_SEPARATOR, bytesWritten, 'utf8'); + + assert(bytesWritten === bytesToWrite, `Error while writing document at position ${dataPosition}.`); + this.size += bytesWritten; + + if (typeof callback === 'function') { + this.flushCallbacks.push(callback); + } + this.scheduleFlush(); + return dataPosition; + } + + truncateReadBuffer(after) { + if (this.readBufferPos >= after) { + this.readBufferPos = -1; + this.readBufferLength = 0; + } else if (this.readBufferPos + this.readBufferLength > after) { + this.readBufferLength -= (this.readBufferPos + this.readBufferLength) - after; + } + } + + truncateAfterSequence(after) { + let position = this.size; + let truncateAt = this.size; + while ((position = this.findDocumentPositionBefore(position)) !== false) { + const reader = this.prepareReadBufferBackwards(position); + if (!reader.buffer) break; + const { sequenceNumber } = this.readDocumentHeader(reader.buffer, reader.cursor, position); + if (sequenceNumber > after) { + truncateAt = position; + } else { + break; + } + } + this.truncate(truncateAt); + } + + truncate(after) { + if (after >= this.size) { + return; + } + this.open(); + after = Math.max(0, after); + this.flush(); + + try { + this.readFrom(after); + } catch (e) { + if (!(e instanceof CorruptFileError)) { + throw new Error('Can only truncate on valid document boundaries.'); + } + } + + this.file.truncate(this.headerSize + after); + this.flush(); + this.truncateReadBuffer(after); + this.size = after; + this.emit('truncated', after); + } +} + +export default MmapWritablePartition; +export { CorruptFileError }; diff --git a/test/MmapPartition.spec.js b/test/MmapPartition.spec.js new file mode 100644 index 0000000..c986d99 --- /dev/null +++ b/test/MmapPartition.spec.js @@ -0,0 +1,58 @@ +import expect from 'expect.js'; +import fs from 'fs-extra'; +import MmapPartition, { ReadOnly as MmapReadOnlyPartition } from '../src/MmapPartition.js'; + +describe('MmapPartition', function () { + const dataDirectory = '/tmp/event-store-mmap-partition-tests'; + + beforeEach(function () { + fs.emptyDirSync(dataDirectory); + }); + + afterEach(function () { + fs.removeSync(dataDirectory); + }); + + it('writes and reads documents', function () { + const partition = new MmapPartition('part-1', { dataDirectory, flushDelay: 0 }); + partition.open(); + + const first = partition.write('one', 0); + const second = partition.write('two', 1); + partition.flush(); + + expect(partition.readFrom(first)).to.be('one'); + expect(partition.readFrom(second)).to.be('two'); + + partition.close(); + partition.open(); + + expect(partition.readFrom(first)).to.be('one'); + expect(partition.readFrom(second)).to.be('two'); + + partition.close(); + }); + + it('emits append in readonly mode after writer flushes', function (done) { + this.timeout(10000); + + const writer = new MmapPartition('part-2', { dataDirectory, flushDelay: 0 }); + writer.open(); + writer.write('initial', 0); + writer.flush(); + + const reader = new MmapReadOnlyPartition('part-2', { dataDirectory }); + reader.open(); + + reader.once('append', function (prevSize, nextSize) { + expect(nextSize).to.be.greaterThan(prevSize); + expect(reader.readFrom(prevSize)).to.be('next'); + reader.close(); + writer.close(); + done(); + }); + + writer.write('next', 1); + writer.flush(); + }); +}); From 38d6c6efbccf742d0f602a010eb602263403d389 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 19:11:49 +0000 Subject: [PATCH 14/23] Fix mmap partition exports and run storage benchmark Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/cd6720f9-1d0f-4808-bfd1-718ce582889c Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- src/Partition/MmapReadablePartition.js | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/Partition/MmapReadablePartition.js b/src/Partition/MmapReadablePartition.js index dd8515d..4cdaf03 100644 --- a/src/Partition/MmapReadablePartition.js +++ b/src/Partition/MmapReadablePartition.js @@ -4,6 +4,7 @@ import ReadablePartition, { InvalidDataSizeError, HEADER_MAGIC, DOCUMENT_ALIGNMENT, + DOCUMENT_SEPARATOR, DOCUMENT_HEADER_SIZE, DOCUMENT_FOOTER_SIZE } from './ReadablePartition.js'; @@ -142,4 +143,4 @@ class MmapReadablePartition extends ReadablePartition { } export default MmapReadablePartition; -export { CorruptFileError, InvalidDataSizeError, HEADER_MAGIC, DOCUMENT_ALIGNMENT, DOCUMENT_HEADER_SIZE, DOCUMENT_FOOTER_SIZE }; +export { CorruptFileError, InvalidDataSizeError, HEADER_MAGIC, DOCUMENT_ALIGNMENT, DOCUMENT_SEPARATOR, DOCUMENT_HEADER_SIZE, DOCUMENT_FOOTER_SIZE }; From af109b8bceea6151f92a8ec38d32201b9c9d8ee3 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 19:14:40 +0000 Subject: [PATCH 15/23] Address review feedback and rerun storage benchmark Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/cd6720f9-1d0f-4808-bfd1-718ce582889c Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- package.json | 2 +- src/Partition/MmapWritablePartition.js | 12 ++++++------ 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/package.json b/package.json index 4866f99..ffa3fab 100644 --- a/package.json +++ b/package.json @@ -48,7 +48,7 @@ "src/metadataUtil.js", "src/AppendOnlyMmapedFile.js", "src/MmapIndex*.js", - "src/MmapPartition*.js", + "src/MmapPartition.js", "src/File/*.js", "index.js" ], diff --git a/src/Partition/MmapWritablePartition.js b/src/Partition/MmapWritablePartition.js index d6e6463..3dcbcaf 100644 --- a/src/Partition/MmapWritablePartition.js +++ b/src/Partition/MmapWritablePartition.js @@ -74,10 +74,6 @@ class MmapWritablePartition extends MmapReadablePartition { return false; } - if (this.syncOnFlush && this.fd) { - this.file.flush(); - } - const callbacks = this.flushCallbacks; this.flushCallbacks = []; for (let i = 0; i < callbacks.length; i++) { @@ -126,7 +122,7 @@ class MmapWritablePartition extends MmapReadablePartition { bytesWritten += this.writeDocumentHeader(target, bytesWritten, dataSize, sequenceNumber); bytesWritten += target.write(data, bytesWritten, 'utf8'); const padSize = alignTo(dataSize + DOCUMENT_FOOTER_SIZE, DOCUMENT_ALIGNMENT); - bytesWritten += target.write(DOCUMENT_PAD.substr(0, padSize), bytesWritten, 'utf8'); + bytesWritten += target.write(DOCUMENT_PAD.slice(0, padSize), bytesWritten, 'utf8'); target.writeUInt32BE(dataSize, bytesWritten); bytesWritten += 4; bytesWritten += target.write(DOCUMENT_SEPARATOR, bytesWritten, 'utf8'); @@ -137,7 +133,11 @@ class MmapWritablePartition extends MmapReadablePartition { if (typeof callback === 'function') { this.flushCallbacks.push(callback); } - this.scheduleFlush(); + if (this.syncOnFlush) { + this.flush(); + } else { + this.scheduleFlush(); + } return dataPosition; } From 6c5711b8ad3323c694aec60010da96f130543027 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 19:15:41 +0000 Subject: [PATCH 16/23] Replace deprecated substr usage in mmap readable partition Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/cd6720f9-1d0f-4808-bfd1-718ce582889c Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- src/Partition/MmapReadablePartition.js | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/Partition/MmapReadablePartition.js b/src/Partition/MmapReadablePartition.js index 4cdaf03..bfddc19 100644 --- a/src/Partition/MmapReadablePartition.js +++ b/src/Partition/MmapReadablePartition.js @@ -55,12 +55,12 @@ class MmapReadablePartition extends ReadablePartition { const headerBuffer = this.file.read(0, 8 + 4); const headerMagic = headerBuffer.toString('utf8', 0, 8); - assert(headerMagic.substr(0, 6) === HEADER_MAGIC.substr(0, 6), `Invalid file header in partition ${this.name}.`); + assert(headerMagic.slice(0, 6) === HEADER_MAGIC.slice(0, 6), `Invalid file header in partition ${this.name}.`); this.header = headerMagic; assert( headerMagic === HEADER_MAGIC, - `Invalid file version. The partition ${this.name} was created with a different library version (${headerMagic.substr(6)}).` + `Invalid file version. The partition ${this.name} was created with a different library version (${headerMagic.slice(6)}).` ); const metadataSize = headerBuffer.readUInt32BE(8); From 710e4292f26cc3326d425ecf2aa1f387d178424b Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 19:18:26 +0000 Subject: [PATCH 17/23] Fix mmap partition review issues and rerun validations Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/cd6720f9-1d0f-4808-bfd1-718ce582889c Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- src/Partition/MmapReadablePartition.js | 4 ++-- src/Partition/MmapWritablePartition.js | 9 ++++++--- test/MmapPartition.spec.js | 4 +++- 3 files changed, 11 insertions(+), 6 deletions(-) diff --git a/src/Partition/MmapReadablePartition.js b/src/Partition/MmapReadablePartition.js index bfddc19..b26ec54 100644 --- a/src/Partition/MmapReadablePartition.js +++ b/src/Partition/MmapReadablePartition.js @@ -10,7 +10,7 @@ import ReadablePartition, { } from './ReadablePartition.js'; import { assert } from '../util.js'; -const NES_EPOCH = new Date('2020-01-01T00:00:00'); +const NODE_EVENT_STORE_EPOCH = new Date('2020-01-01T00:00:00'); class MmapReadablePartition extends ReadablePartition { @@ -70,7 +70,7 @@ class MmapReadablePartition extends ReadablePartition { const metadata = this.file.readString(12, metadataSize).trim(); try { this.metadata = JSON.parse(metadata); - this.metadata.epoch = this.metadata.epoch || NES_EPOCH.getTime(); + this.metadata.epoch = this.metadata.epoch || NODE_EVENT_STORE_EPOCH.getTime(); } catch (e) { throw new Error('Invalid metadata.'); } diff --git a/src/Partition/MmapWritablePartition.js b/src/Partition/MmapWritablePartition.js index 3dcbcaf..2fbe73d 100644 --- a/src/Partition/MmapWritablePartition.js +++ b/src/Partition/MmapWritablePartition.js @@ -25,13 +25,16 @@ class MmapWritablePartition extends MmapReadablePartition { clock: Clock, flushDelay: 0 }; - config.metadata = Object.assign(defaults.metadata, config.metadata); - config = Object.assign(defaults, config); + const metadata = Object.assign({}, defaults.metadata, config.metadata); + config = Object.assign({}, defaults, config, { metadata }); super(name, config); this.syncOnFlush = !!config.syncOnFlush; this.flushDelay = config.flushDelay >>> 0; // jshint ignore:line - assert(typeof(config.clock.prototype) === 'object' && typeof(config.clock.prototype.time) === 'function', 'Clock needs to implement the method time()'); + assert( + typeof(config.clock.prototype) === 'object' && typeof(config.clock.prototype.time) === 'function', + 'Clock constructor prototype needs to implement the method time().' + ); this.ClockConstructor = config.clock; } diff --git a/test/MmapPartition.spec.js b/test/MmapPartition.spec.js index c986d99..e3752cb 100644 --- a/test/MmapPartition.spec.js +++ b/test/MmapPartition.spec.js @@ -1,9 +1,11 @@ import expect from 'expect.js'; +import os from 'os'; +import path from 'path'; import fs from 'fs-extra'; import MmapPartition, { ReadOnly as MmapReadOnlyPartition } from '../src/MmapPartition.js'; describe('MmapPartition', function () { - const dataDirectory = '/tmp/event-store-mmap-partition-tests'; + const dataDirectory = path.join(os.tmpdir(), 'event-store-mmap-partition-tests'); beforeEach(function () { fs.emptyDirSync(dataDirectory); From 043818eae630b37fc9290079ebcee41141eff1ef Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 20:07:30 +0000 Subject: [PATCH 18/23] Use mmap buffer directly in mmap partition read and write paths Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/7a68bbbf-8d33-4be1-b8be-ba0240440918 Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- src/Partition/MmapReadOnlyPartition.js | 2 + src/Partition/MmapReadablePartition.js | 56 +++++++++++++------------- src/Partition/MmapWritablePartition.js | 12 +----- 3 files changed, 32 insertions(+), 38 deletions(-) diff --git a/src/Partition/MmapReadOnlyPartition.js b/src/Partition/MmapReadOnlyPartition.js index 574da6b..6fd34d0 100644 --- a/src/Partition/MmapReadOnlyPartition.js +++ b/src/Partition/MmapReadOnlyPartition.js @@ -11,6 +11,7 @@ class MmapReadOnlyPartition extends MmapReadablePartition { const nextSize = Math.max(0, newFileSize - this.headerSize); if (nextSize > prevSize) { this.size = nextSize; + this.updateReadPointer(); this.emit('append', prevSize, nextSize); } }); @@ -20,6 +21,7 @@ class MmapReadOnlyPartition extends MmapReadablePartition { const nextSize = Math.max(0, newFileSize - this.headerSize); if (nextSize < prevSize) { this.size = nextSize; + this.updateReadPointer(); this.emit('truncate', prevSize, nextSize); } }); diff --git a/src/Partition/MmapReadablePartition.js b/src/Partition/MmapReadablePartition.js index b26ec54..7f02429 100644 --- a/src/Partition/MmapReadablePartition.js +++ b/src/Partition/MmapReadablePartition.js @@ -35,10 +35,6 @@ class MmapReadablePartition extends ReadablePartition { this.file.open(); this.fd = this.file.fd; - this.readBuffer = Buffer.allocUnsafeSlow(this.readBufferSize); - this.readBufferPos = -1; - this.readBufferLength = 0; - this.headerSize = 0; this.size = this.readFileSize(); if (this.size <= 0) { @@ -47,6 +43,7 @@ class MmapReadablePartition extends ReadablePartition { } this.size -= this.readMetadata(); + this.updateReadPointer(); return true; } @@ -86,24 +83,37 @@ class MmapReadablePartition extends ReadablePartition { close() { this.file.close(); this.fd = null; - if (this.readBuffer) { - this.readBuffer = null; - this.readBufferPos = -1; - this.readBufferLength = 0; + this.readBuffer = null; + this.readBufferPos = -1; + this.readBufferLength = 0; + } + + updateReadPointer() { + this.readBuffer = this.file.mapBuffer; + this.readBufferPos = -this.headerSize; + this.readBufferLength = this.headerSize + this.size; + } + + prepareReadBuffer(position) { + if (position + DOCUMENT_HEADER_SIZE >= this.size) { + return { buffer: null, cursor: 0, length: 0 }; } + return { + buffer: this.readBuffer, + cursor: position - this.readBufferPos, + length: this.readBufferLength + }; } - fillBuffer(from = 0) { - const available = Math.max(0, Math.min(this.readBuffer.byteLength, this.size - from)); - if (available === 0) { - this.readBufferLength = 0; - this.readBufferPos = from; - return; + prepareReadBufferBackwards(position) { + if (position < 0) { + return { buffer: null, cursor: 0, length: 0 }; } - const source = this.file.read(this.headerSize + from, available); - source.copy(this.readBuffer, 0, 0, available); - this.readBufferLength = available; - this.readBufferPos = from; + return { + buffer: this.readBuffer, + cursor: position - this.readBufferPos, + length: this.readBufferLength + }; } readFrom(position, size = 0, headerOut = null) { @@ -128,16 +138,6 @@ class MmapReadablePartition extends ReadablePartition { throw new CorruptFileError(`Invalid document at position ${position}. This may be caused by an unfinished write.`); } - if (dataSize + DOCUMENT_HEADER_SIZE > reader.buffer.byteLength) { - const absoluteDataPosition = this.headerSize + position + DOCUMENT_HEADER_SIZE; - return this.file.readString(absoluteDataPosition, dataSize); - } - - if (reader.cursor > 0 && dataPosition + dataSize > reader.length) { - this.fillBuffer(position); - dataPosition = DOCUMENT_HEADER_SIZE; - } - return reader.buffer.toString('utf8', dataPosition, dataPosition + dataSize); } } diff --git a/src/Partition/MmapWritablePartition.js b/src/Partition/MmapWritablePartition.js index 2fbe73d..840112c 100644 --- a/src/Partition/MmapWritablePartition.js +++ b/src/Partition/MmapWritablePartition.js @@ -120,6 +120,7 @@ class MmapWritablePartition extends MmapReadablePartition { const dataPosition = this.size; const bytesToWrite = this.documentWriteSize(dataSize); const target = this.file.reserve(bytesToWrite); + this.updateReadPointer(); let bytesWritten = 0; bytesWritten += this.writeDocumentHeader(target, bytesWritten, dataSize, sequenceNumber); @@ -144,15 +145,6 @@ class MmapWritablePartition extends MmapReadablePartition { return dataPosition; } - truncateReadBuffer(after) { - if (this.readBufferPos >= after) { - this.readBufferPos = -1; - this.readBufferLength = 0; - } else if (this.readBufferPos + this.readBufferLength > after) { - this.readBufferLength -= (this.readBufferPos + this.readBufferLength) - after; - } - } - truncateAfterSequence(after) { let position = this.size; let truncateAt = this.size; @@ -187,8 +179,8 @@ class MmapWritablePartition extends MmapReadablePartition { this.file.truncate(this.headerSize + after); this.flush(); - this.truncateReadBuffer(after); this.size = after; + this.updateReadPointer(); this.emit('truncated', after); } } From 29d0fb3923e83d1445335395470d8f315e25e881 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 20:57:24 +0000 Subject: [PATCH 19/23] perf(mmap): defer marker write to flush, skip fdatasync when syncOnFlush=false, remove redundant mmap.sync Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/0e91957c-d8cf-43b2-b439-215ce3b593cd Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- src/File/AppendOnlyMmapedFile.js | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/src/File/AppendOnlyMmapedFile.js b/src/File/AppendOnlyMmapedFile.js index 3f55980..c0393b2 100644 --- a/src/File/AppendOnlyMmapedFile.js +++ b/src/File/AppendOnlyMmapedFile.js @@ -124,6 +124,7 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { this.pageSize = mmap.PAGESIZE; this.writeBufferSize = Math.max(this.pageSize, options.writeBufferSize || DEFAULT_WRITE_BUFFER_SIZE); this.initialData = options.initialData ? Buffer.from(options.initialData) : null; + this.syncOnFlush = !!options.syncOnFlush; this.hasPendingData = false; } @@ -142,10 +143,12 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { if (!this.hasPendingData) { return false; } - mmap.sync(this.mapBuffer, true); + this.writeFileSizeMarker(); const now = new Date(); fs.futimesSync(this.fd, now, now); - fs.fdatasyncSync(this.fd); + if (this.syncOnFlush) { + fs.fdatasyncSync(this.fd); + } this.hasPendingData = false; return true; } @@ -240,7 +243,6 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { } buffer.copy(this.mapBuffer, writePosition); this.fileSize = endPosition; - this.writeFileSizeMarker(); this.hasPendingData = true; return writePosition; } @@ -262,7 +264,6 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { this.grow(endPosition); } this.fileSize = endPosition; - this.writeFileSizeMarker(); this.hasPendingData = true; return this.mapBuffer.subarray(writePosition, endPosition); } From b4b67460de54ded3d6dd33f1e403d49ff4edc98e Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 20:59:03 +0000 Subject: [PATCH 20/23] perf(mmap): address review - clarify comments in flush() Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/0e91957c-d8cf-43b2-b439-215ce3b593cd Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- src/File/AppendOnlyMmapedFile.js | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/File/AppendOnlyMmapedFile.js b/src/File/AppendOnlyMmapedFile.js index c0393b2..69c87ac 100644 --- a/src/File/AppendOnlyMmapedFile.js +++ b/src/File/AppendOnlyMmapedFile.js @@ -143,10 +143,13 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { if (!this.hasPendingData) { return false; } + // Written once per flush instead of per write to avoid touching a second OS page on every append. + // truncate() still writes immediately so concurrent readers see the correct truncated size. this.writeFileSizeMarker(); const now = new Date(); fs.futimesSync(this.fd, now, now); if (this.syncOnFlush) { + // syncOnFlush: false (default) skips fdatasync for throughput; set true when strict durability is required. fs.fdatasyncSync(this.fd); } this.hasPendingData = false; From a107bb43d862db272d20adc0613a293ec97a3bf7 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 21:38:01 +0000 Subject: [PATCH 21/23] Add forked storage benchmark script Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/9333e5a7-ad3f-4843-a679-ef6f910cef2c Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- bench/package.json | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/bench/package.json b/bench/package.json index e6443ed..6a925b1 100644 --- a/bench/package.json +++ b/bench/package.json @@ -3,7 +3,8 @@ "version": "0.0.1", "type": "module", "scripts": { - "bench": "node bench-index.js && node bench-storage.js && node bench-eventstore.js && node bench-read-scenarios.js" + "bench": "node bench-index.js && node bench-storage.js && node bench-eventstore.js && node bench-read-scenarios.js", + "bench:storage:forked": "node bench-storage-forked.js" }, "dependencies": { "@riaskov/mmap-io": "^1.4.3", From 694ef60cb03cd1d4d2b8f9863408f53144b0180e Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 14 May 2026 21:57:04 +0000 Subject: [PATCH 22/23] Add forked multi-process storage benchmark Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/9333e5a7-ad3f-4843-a679-ef6f910cef2c Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- bench/bench-storage-forked.js | 494 ++++++++++++++++++++++++++++++++++ 1 file changed, 494 insertions(+) create mode 100644 bench/bench-storage-forked.js diff --git a/bench/bench-storage-forked.js b/bench/bench-storage-forked.js new file mode 100644 index 0000000..f35352a --- /dev/null +++ b/bench/bench-storage-forked.js @@ -0,0 +1,494 @@ +import fs from 'fs-extra'; +import { fork } from 'child_process'; +import { createRequire } from 'module'; +import { fileURLToPath } from 'url'; +import { hrtime } from 'process'; +import Stable from 'event-storage'; +import { Storage as LatestStorage } from '../index.js'; +import LatestReadableStorage from '../src/Storage/ReadableStorage.js'; +import MmapWritableIndex from '../src/Index/MmapWritableIndex.js'; +import MmapReadOnlyIndex from '../src/Index/MmapReadOnlyIndex.js'; +import MmapWritablePartition from '../src/Partition/MmapWritablePartition.js'; +import MmapReadOnlyPartition from '../src/Partition/MmapReadOnlyPartition.js'; + +const require = createRequire(import.meta.url); +const StableReadableStorage = require('event-storage/src/Storage/ReadableStorage'); +const WRITES = 1000; +const READER_STEPS = [1, 2, 4, 8, 16]; +const scriptPath = fileURLToPath(import.meta.url); +const readerWarmupDelayNs = 50_000_000n; + +class MmapStorage extends LatestStorage { + createIndex(name, options = {}) { + return { index: new MmapWritableIndex(name, options) }; + } + + createPartition(name, options = {}) { + return new MmapWritablePartition(name, options); + } +} + +class MmapReadableStorage extends LatestReadableStorage { + createIndex(name, options = {}) { + return { index: new MmapReadOnlyIndex(name, options) }; + } + + createPartition(name, options = {}) { + return new MmapReadOnlyPartition(name, options); + } +} + +function getStableWriterClass() { + return Stable.Storage; +} + +function getStableReaderClass() { + return StableReadableStorage; +} + +function getVariantConfig(variant) { + if (variant === 'stable') { + return { + label: 'stable', + dataDirectory: 'data/stable-forked', + WriterClass: getStableWriterClass(), + ReaderClass: getStableReaderClass() + }; + } + if (variant === 'latest') { + return { + label: 'latest', + dataDirectory: 'data/latest-forked', + WriterClass: LatestStorage, + ReaderClass: LatestReadableStorage + }; + } + if (variant === 'mmap') { + return { + label: 'mmap', + dataDirectory: 'data/mmap-forked', + WriterClass: MmapStorage, + ReaderClass: MmapReadableStorage + }; + } + throw new Error(`Unknown variant "${variant}".`); +} + +function createWriterStorage(variant, storageName, dataDirectory) { + const { WriterClass } = getVariantConfig(variant); + return new WriterClass(storageName, { dataDirectory, syncOnFlush: true }); +} + +function createReaderStorage(variant, storageName, dataDirectory) { + const { ReaderClass } = getVariantConfig(variant); + if (!ReaderClass) { + throw new Error(`Variant "${variant}" does not expose a read-only storage.`); + } + return new ReaderClass(storageName, { dataDirectory }); +} + +function openStorage(storage) { + return new Promise((resolve, reject) => { + let settled = false; + let timeout = null; + const finish = () => { + if (settled) { + return; + } + settled = true; + if (timeout) { + clearImmediate(timeout); + } + storage.removeListener?.('opened', finish); + storage.removeListener?.('error', fail); + resolve(storage); + }; + const fail = (error) => { + if (settled) { + return; + } + settled = true; + if (timeout) { + clearImmediate(timeout); + } + storage.removeListener?.('opened', finish); + storage.removeListener?.('error', fail); + reject(error); + }; + + storage.once?.('opened', finish); + storage.once?.('error', fail); + storage.open(finish); + timeout = setImmediate(() => { + const initialized = !('initialized' in storage) || storage.initialized !== false; + const indexOpen = typeof storage.index?.isOpen !== 'function' || storage.index.isOpen(); + if (initialized && indexOpen) { + finish(); + } + }); + }); +} + +function toMilliseconds(durationNs) { + return Number(durationNs) / 1e6; +} + +function formatMilliseconds(durationNs) { + return toMilliseconds(durationNs).toFixed(3); +} + +function percentile(sortedValues, ratio) { + if (sortedValues.length === 0) { + return 0n; + } + const index = Math.min(sortedValues.length - 1, Math.ceil(sortedValues.length * ratio) - 1); + return sortedValues[index]; +} + +function serializeError(error) { + return { + message: error?.message || String(error), + stack: error?.stack || '' + }; +} + +function createReaderProcess({ variant, storageName, dataDirectory, writes, readerId }) { + const child = fork(scriptPath, ['worker'], { + stdio: ['inherit', 'inherit', 'inherit', 'ipc'], + env: { + ...process.env, + BENCH_VARIANT: variant, + BENCH_STORAGE_NAME: storageName, + BENCH_DATA_DIRECTORY: dataDirectory, + BENCH_WRITES: String(writes), + BENCH_READER_ID: String(readerId) + } + }); + const messageQueue = new Map(); + const waiters = new Map(); + let settledDone = false; + let resolveDone; + let rejectDone; + let resolveExit; + let rejectExit; + + const donePromise = new Promise((resolve, reject) => { + resolveDone = resolve; + rejectDone = reject; + }); + const exitPromise = new Promise((resolve, reject) => { + resolveExit = resolve; + rejectExit = reject; + }); + + child.on('message', (message) => { + if (!message || typeof message.type !== 'string') { + return; + } + if (message.type === 'error') { + const error = new Error(message.error?.message || 'Child process failed.'); + if (message.error?.stack) { + error.stack = message.error.stack; + } + rejectDone(error); + const waiter = waiters.get('error'); + if (waiter) { + waiters.delete('error'); + waiter.reject(error); + } + return; + } + if (message.type === 'done') { + settledDone = true; + resolveDone(message); + } + const waiter = waiters.get(message.type); + if (waiter) { + waiters.delete(message.type); + waiter.resolve(message); + return; + } + const queuedMessages = messageQueue.get(message.type) || []; + queuedMessages.push(message); + messageQueue.set(message.type, queuedMessages); + }); + + child.once('exit', (code, signal) => { + resolveExit(); + if (!settledDone && code !== 0) { + rejectDone(new Error(`Reader process ${readerId} exited with code ${code} and signal ${signal}.`)); + } + }); + + child.once('error', (error) => { + rejectDone(error); + rejectExit(error); + }); + + return { + child, + donePromise, + exitPromise, + send(message) { + child.send(message); + }, + waitFor(type) { + return new Promise((resolve, reject) => { + const queuedMessages = messageQueue.get(type); + if (queuedMessages?.length) { + const message = queuedMessages.shift(); + if (queuedMessages.length === 0) { + messageQueue.delete(type); + } + resolve(message); + return; + } + waiters.set(type, { resolve, reject }); + }); + } + }; +} + +async function runCase(variant, readers) { + const { label, dataDirectory } = getVariantConfig(variant); + const storageName = `storage-forked-${label}-${readers}`; + fs.emptyDirSync(dataDirectory); + + const writer = createWriterStorage(variant, storageName, dataDirectory); + await openStorage(writer); + + const readerProcesses = Array.from({ length: readers }, (_, readerId) => createReaderProcess({ + variant, + storageName, + dataDirectory, + writes: WRITES, + readerId + })); + + try { + await Promise.all(readerProcesses.map(readerProcess => readerProcess.waitFor('ready'))); + readerProcesses.forEach(readerProcess => readerProcess.send({ type: 'arm' })); + await Promise.all(readerProcesses.map(readerProcess => readerProcess.waitFor('armed'))); + + const startNs = hrtime.bigint() + readerWarmupDelayNs; + readerProcesses.forEach(readerProcess => readerProcess.send({ type: 'start', startNs: startNs.toString() })); + + const waitMs = Math.max(0, Math.ceil(Number(startNs - hrtime.bigint()) / 1e6)); + if (waitMs > 0) { + await new Promise(resolve => setTimeout(resolve, waitMs)); + } + + const baseDocument = { + doc: 'this is some test document for measuring performance', + value: 123.45, + amount: 999, + pad: ' '.repeat(32), + seq: 0, + writeStartedAtNs: '0' + }; + + for (let number = 1; number <= WRITES; number++) { + baseDocument.seq = number; + baseDocument.writeStartedAtNs = hrtime.bigint().toString(); + writer.write(baseDocument); + writer.flush(); + } + + const results = await Promise.all(readerProcesses.map(readerProcess => readerProcess.donePromise)); + const durationsNs = results.map(result => BigInt(result.durationNs)); + const totalDurationNs = durationsNs.reduce((max, durationNs) => durationNs > max ? durationNs : max, 0n); + const averageDurationNs = durationsNs.reduce((sum, durationNs) => sum + durationNs, 0n) / BigInt(durationsNs.length); + const latencyValues = results + .flatMap(result => result.latenciesNs.map(value => BigInt(value))) + .sort((left, right) => left < right ? -1 : left > right ? 1 : 0); + const totalLatencyNs = latencyValues.reduce((sum, value) => sum + value, 0n); + const averageLatencyNs = totalLatencyNs / BigInt(latencyValues.length); + const p95LatencyNs = percentile(latencyValues, 0.95); + const maxLatencyNs = latencyValues[latencyValues.length - 1]; + + return { + variant: label, + readers, + totalDurationNs, + averageDurationNs, + averageLatencyNs, + p95LatencyNs, + maxLatencyNs + }; + } finally { + writer.close(); + await Promise.all(readerProcesses.map(async (readerProcess) => { + readerProcess.send({ type: 'stop' }); + await readerProcess.exitPromise; + })); + } +} + +function printResults(rows) { + const headers = ['Variant', 'Readers', 'All readers done (ms)', 'Avg reader done (ms)', 'Avg visibility latency (ms)', 'P95 latency (ms)', 'Max latency (ms)']; + const table = rows.map((row) => ([ + row.variant, + String(row.readers), + formatMilliseconds(row.totalDurationNs), + formatMilliseconds(row.averageDurationNs), + formatMilliseconds(row.averageLatencyNs), + formatMilliseconds(row.p95LatencyNs), + formatMilliseconds(row.maxLatencyNs) + ])); + const widths = headers.map((header, index) => Math.max(header.length, ...table.map(row => row[index].length))); + const formatRow = (row) => `| ${row.map((value, index) => value.padEnd(widths[index])).join(' | ')} |`; + const separator = `|-${widths.map(width => '-'.repeat(width)).join('-|-')}-|`; + + console.log(formatRow(headers)); + console.log(separator); + for (const row of table) { + console.log(formatRow(row)); + } +} + +async function runParent() { + const rows = []; + for (const variant of ['stable', 'latest', 'mmap']) { + for (const readers of READER_STEPS) { + rows.push(await runCase(variant, readers)); + } + } + printResults(rows); +} + +async function runWorker() { + const variant = process.env.BENCH_VARIANT; + const storageName = process.env.BENCH_STORAGE_NAME; + const dataDirectory = process.env.BENCH_DATA_DIRECTORY; + const writes = Number(process.env.BENCH_WRITES); + const readerId = Number(process.env.BENCH_READER_ID); + const storage = createReaderStorage(variant, storageName, dataDirectory); + let active = false; + let draining = false; + let benchmarkStartNs = 0n; + let seen = 0; + const latenciesNs = []; + let pollTimer = null; + + const stopPolling = () => { + if (pollTimer) { + clearInterval(pollTimer); + pollTimer = null; + } + }; + + const refreshReadableLength = () => { + if (typeof storage.index?.readFileLength !== 'function' || !Array.isArray(storage.index?.data)) { + return; + } + const refreshedLength = storage.index.readFileLength(); + if (refreshedLength > storage.index.data.length) { + storage.index.data.length = refreshedLength; + } + }; + + const refreshPartitions = () => { + const files = fs.readdirSync(storage.dataDirectory); + for (const file of files) { + if (!file.startsWith(storage.storageFile) || file.endsWith('.index') || file.endsWith('.branch') || file.endsWith('.lock')) { + continue; + } + const partition = storage.createPartition(file, storage.partitionConfig); + if (typeof storage.partitions?.has === 'function' && typeof storage.partitions?.add === 'function') { + if (!storage.partitions.has(partition.id)) { + storage.partitions.add(partition.id, partition); + } + continue; + } + if (!(partition.id in storage.partitions)) { + storage.partitions[partition.id] = partition; + } + } + }; + + async function drainDocuments() { + if (draining) { + return; + } + draining = true; + try { + while (active && seen < writes) { + const document = storage.read(seen + 1); + if (document === false) { + return; + } + if (document.seq !== seen + 1) { + throw new Error(`Reader ${readerId} expected document #${seen + 1} but received #${document.seq}.`); + } + const latencyNs = hrtime.bigint() - BigInt(document.writeStartedAtNs); + latenciesNs.push(latencyNs.toString()); + seen++; + } + + if (active && seen === writes) { + active = false; + stopPolling(); + process.send?.({ + type: 'done', + readerId, + durationNs: (hrtime.bigint() - benchmarkStartNs).toString(), + latenciesNs + }); + } + } finally { + draining = false; + } + } + + process.on('message', async (message) => { + try { + if (message.type === 'arm') { + process.send?.({ type: 'armed', readerId }); + return; + } + if (message.type === 'start') { + benchmarkStartNs = BigInt(message.startNs); + active = true; + if (!pollTimer) { + pollTimer = setInterval(() => { + try { + refreshPartitions(); + refreshReadableLength(); + drainDocuments().catch((error) => { + process.send?.({ type: 'error', error: serializeError(error), readerId }); + }); + } catch (error) { + process.send?.({ type: 'error', error: serializeError(error), readerId }); + } + }, 1); + pollTimer.unref?.(); + } + await drainDocuments(); + return; + } + if (message.type === 'stop') { + stopPolling(); + storage.close(); + process.exit(0); + } + } catch (error) { + process.send?.({ type: 'error', error: serializeError(error), readerId }); + } + }); + + try { + await openStorage(storage); + process.send?.({ type: 'ready', readerId }); + } catch (error) { + process.send?.({ type: 'error', error: serializeError(error), readerId }); + } +} + +if (process.argv[2] === 'worker') { + runWorker(); +} else { + runParent().catch((error) => { + console.error(error); + process.exit(1); + }); +} From e4ab26695fffdb170364a6e212b74929415b8ea2 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Fri, 22 May 2026 14:33:13 +0000 Subject: [PATCH 23/23] Optimize mmap grow path to keep marker writes flush-driven Agent-Logs-Url: https://github.com/albe/node-event-storage/sessions/ff8309e4-215b-45a8-b61a-5bb124c4f30b Co-authored-by: albe <4259532+albe@users.noreply.github.com> --- src/File/AppendOnlyMmapedFile.js | 2 -- 1 file changed, 2 deletions(-) diff --git a/src/File/AppendOnlyMmapedFile.js b/src/File/AppendOnlyMmapedFile.js index 69c87ac..ace0881 100644 --- a/src/File/AppendOnlyMmapedFile.js +++ b/src/File/AppendOnlyMmapedFile.js @@ -231,8 +231,6 @@ class WritableAppendOnlyMmapedFile extends ReadableAppendOnlyMmapedFile { fs.ftruncateSync(this.fd, nextMappedSize); this.map(nextMappedSize); this.fileSize = requiredFileSize; - this.writeFileSizeMarker(); - this.hasPendingData = true; return true; }