yifan zou created BEAM-7109:
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Summary: Thread leaking in Portable Python Precommit
Key: BEAM-7109
URL: https://issues.apache.org/jira/browse/BEAM-7109
Project: Beam
Issue Type: Bug
Components: testing
Reporter: yifan zou
Beam Jenkins constantly break due to some weird errors such as "Unable to
create new native thread". The recent build worker failure happened on
[apache-beam-jenkins-8|[https://builds.apache.org/computer/apache-beam-jenkins-8/builds]].
Checking the thread number on that VM shows:
Thread limit: kernel.pid_max = 32768
Actual used: 32411
Dumping the thread usage (see attachment) exposed thread leaking on some Python
tests. And based on the execution history of the jenkins-8, the
[beam_PreCommit_Portable_Python_Commit|[https://builds.apache.org/job/beam_PreCommit_Portable_Python_Commit/]]
is suspicious. We ran this test multiple times on a plain node and observed
that some thread started by +_apache_beam.runners.worker.sdk_worker_main_+ were
not tear down after tests complete. The stale threads finally accumulated and
ate the VM kernel thread quota. __
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