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Set rapidsmpf asyncio loop to use py_executor #858

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Set rapidsmpf asyncio loop to use py_executor #858

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9 changes: 8 additions & 1 deletion python/rapidsmpf/rapidsmpf/streaming/core/node.pyx
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
# SPDX-FileCopyrightText: Copyright (c) 2025, NVIDIA CORPORATION & AFFILIATES.
# SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION & AFFILIATES.
# SPDX-License-Identifier: Apache-2.0

from cython.operator cimport dereference as deref
Expand Down Expand Up @@ -200,6 +200,11 @@ def run_streaming_pipeline(*, nodes, py_executor = None):
Executor used to run Python nodes (required if any Python nodes are present).
If no Python nodes are provided, this is ignored.

``py_executor`` is set as the default executor on the event loop managed
by rapidsmpf. If your Python nodes include an
``await asyncio.to_thread(blocking_function)`` then the blocking function
will run in ``py_executor``.

Warnings
--------
C++ nodes are released and must not be used after this call.
Expand Down Expand Up @@ -252,6 +257,8 @@ def run_streaming_pipeline(*, nodes, py_executor = None):
)

async def runner():
loop = asyncio.get_running_loop()
loop.set_default_executor(py_executor)
return await asyncio.gather(*py_nodes)

if len(py_nodes) > 0:
Expand Down
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