Boundary Couchbase Plugin

Tracks the fork rate on your server by polling the Couchbase REST API at "http://localhost:8091/" (configurable setting).

Prerequisites

Supported OS

OS	Linux	Windows	SmartOS	OS X
Supported	v	v	v	v

• Written in pure Lua/Luvit (embedded in boundary-meter) therefore no dependencies are required.
• Metrics are collected via HTTP requests, therefore all OSes should work (tested on Debian-based Linux distributions).

Requires Boundary Meter versions v4.2 or later

• To install new meter go to Settings->Installation or see instructions.
• To upgrade the meter to the latest version - see instructions.

Plugin Setup

• A working Couchbase server configured to run on the same machine (reachable at 127.0.0.1:8091)

Plugin Configuration Fields

For advanced metrics please set a longer polling interval to minimize load on the Couchbase instance (e.g. 5000ms or more).

Setting Name	Description
Host	Couchbase service host for the node.
Port	The Couchbase service port for the node.
Username	The administrative username to access the Couchbase server
Password	The administrative password to access the Couchbase server.
Advanced Metrics	Produce more detailed metrics (more expensive to compile).
Poll Interval	How often (in milliseconds) to poll the Couchbase node for metrics.
Source	The Source to display in the legend for the data. It will default to the hostname of the server.

Metrics Collected

Standard Metrics

Metric Name	Description
COUCHBASE_RAM_QUOTA_TOTAL	Total quota of memory allocated by the Couchbase cluster for this node.
COUCHBASE_RAM_QUOTA_USED	Amount of memry used on this node by Couchbase from the allocated quota.
COUCHBASE_CPU_USAGE_RATE	CPU utilization percent.
COUCHBASE_RAM_SYSTEM_TOTAL	Total amount of memory on this node as reported by Couchbase.
COUCHBASE_RAM_SYSTEM_FREE	Amount of memory used on this node as reported by Couchbase.
COUCHBASE_SWAP_TOTAL	Total swap space on this node as reported by Couchbase.
COUCHBASE_SWAP_USED	Userd swap space on this node as reported by Couchbase.
COUCHBASE_OPERATIONS	Number of currently on-going operations on this node.
COUCHBASE_DOCUMENTS_COUNT	Number of documents stored on this node.
COUCHBASE_DOCUMENTS_SIZE	Size of the data in the documents stored on this node.
COUCHBASE_DOCUMENTS_SIZE_ON_DISK	Size on disk of the documents stored on this node.
COUCHBASE_VIEWS_SIZE	Size of the data in the indexed views on this node.
COUCHBASE_VIEWS_SIZE_ON_DISK	Size on disk of the indexed views on this node.

Advanced Metrics (more expensive retrieval)

Metric Name	Description
COUCHBASE_DOCUMENTS_FRAGMENTATION	Rate of fragmentation of document data.
COUCHBASE_VIEWS_FRAGMENTATION	Rate of fragmentation of views data (i.e. indexes).
COUCHBASE_VIEWS_OPERATIONS	Number of currently on-going views-related operations on this node (e.g. queries).
COUCHBASE_DISK_COMMIT_TIME	Average time for disk commit operations on this node.
COUCHBASE_DISK_UPDATE_TIME	Average time for disk update operations on this node.
COUCHBASE_CAS_HITS	Number of successful CAS comparisons.
COUCHBASE_CAS_MISSES	Number of unsuccessful CAS comparisons.
COUCHBASE_DISK_FETCHES	Number of times Couchbase went to disk to get data (non-resident data) per second.
COUCHBASE_EVICTIONS	Number of times COuchbase evicted data from the resident memory to free-up space.
COUCHBASE_MISSES	Number of operations on missing documents.
COUCHBASE_XDCR_OPERATIONS	Cross-datacenter replication operations on this node.
COUCHBASE_REPLICATION_CHANGES_LEFT	Number of replication operations queued and yet to be performed.
COUCHBASE_MAJOR_FAULTS	Number of major faults on this node.
COUCHBASE_MINOR_FAULTS	Number of minor faults on this node.
COUCHBASE_PAGE_FAULTS	Number of memory page faults on this node.
COUCHBASE_ACTIVE_CONNECTIONS	Number of currently active connections established with this node.

Dashboards

• Couchbase Summary
• Couchbae Advanced Metrics

References

Couchbase REST API Reference