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https://issues.apache.org/jira/browse/BEAM-7109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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yifan zou updated BEAM-7109:
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Attachment: threadDump.txt
> 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
> Priority: Critical
> Attachments: threadDump.txt
>
>
> 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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