[test][python] Avoid forking MCP test server from PyFlink process - #896
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Co-authored-by: Codex <codex@openai.com>
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Purpose of change
The MCP integration test starts its local MCP server with
multiprocessing.Process. In GitHub Actions, this forks the already multi-threaded PyFlink and gRPC test process. The fork can corrupt the shared Py4J gateway, causing later PyFlink calls to fail with errors such asPy4JError: org does not exist in the JVM.Start each MCP server in a fresh Python subprocess instead, and wait for it to terminate during cleanup. This isolates the server from the PyFlink gateway and avoids leaking server processes between parameterized cases.
Tests
ruff checkandruff format --checkfor the changed Python testtest_durable_execute_basic_flinkto verify the PyFlink gateway remains usableAPI
No public API changes.
Documentation
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