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https://issues.apache.org/jira/browse/FLINK-33613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dian Fu reassigned FLINK-33613:
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Assignee: Dian Fu
> Python UDF Runner process leak in Process Mode
> ----------------------------------------------
>
> Key: FLINK-33613
> URL: https://issues.apache.org/jira/browse/FLINK-33613
> Project: Flink
> Issue Type: Bug
> Components: API / Python
> Affects Versions: 1.17.0
> Reporter: Yu Chen
> Assignee: Dian Fu
> Priority: Major
> Labels: pull-request-available
> Attachments: ps-ef.txt, streaming_word_count-1.py
>
>
> While working with PyFlink, we found that in Process Mode, the Python UDF
> process may leak after a failover of the job. It leads to a rising number of
> processes with their threads in the host machine, which eventually results in
> failure to create new threads.
>
> You can try to reproduce it with the attached test task
> `streamin_word_count.py`.
> (Note that the job will continue failover, and you can watch the process
> leaks by `ps -ef` on Taskmanager.
>
> Our test environment:
> * K8S Application Mode
> * 4 Taskmanagers with 12 slots/TM
> * Job's parallelism was set to 48
> The udf process `pyflink.fn_execution.beam.beam_boot` should be consistence
> with slots of TM (12), but we found that there are 180 processes on one
> Taskmanager after several failovers.
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