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https://issues.apache.org/jira/browse/AIRFLOW-1885?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Barker updated AIRFLOW-1885:
---------------------------------
Summary: IndexError when polling ready workers and a gunicorn worker
becomes a zombie (was: Exception when polling ready workers and a gunicorn
worker becomes a zombie)
> IndexError when polling ready workers and a gunicorn worker becomes a zombie
> ----------------------------------------------------------------------------
>
> Key: AIRFLOW-1885
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1885
> Project: Apache Airflow
> Issue Type: Bug
> Affects Versions: Airflow 1.8
> Reporter: John Barker
> Assignee: John Barker
>
> If one of the gunicorn workers happens to become a zombie between
> {{children()}} and {{cmdline()}} calls to psutil in
> {{get_num_ready_workers_running}} will raise an IndexError:
> {code}
> Traceback (most recent call last):
> File "/usr/local/bin/airflow", line 28, in <module>
> args.func(args)
> File "/usr/local/lib/python3.5/dist-packages/airflow/bin/cli.py", line 803,
> in webserver
> restart_workers(gunicorn_master_proc, num_workers)
> File "/usr/local/lib/python3.5/dist-packages/airflow/bin/cli.py", line 687,
> in restart_workers
> num_ready_workers_running =
> get_num_ready_workers_running(gunicorn_master_proc)
> File "/usr/local/lib/python3.5/dist-packages/airflow/bin/cli.py", line 663,
> in get_num_ready_workers_running
> proc for proc in workers
> File "/usr/local/lib/python3.5/dist-packages/airflow/bin/cli.py", line 664,
> in <listcomp>
> if settings.GUNICORN_WORKER_READY_PREFIX in proc.cmdline()[0]
> IndexError: list index out of range
> {code}
> In version 4.2 of psutil, {{cmdline}} can return an empty array if the
> process is zombied:
> https://github.com/giampaolo/psutil/blob/release-4.2.0/psutil/_pslinux.py#L1007
> so ensure that an array is actually returned from {{cmdline}} before doing
> the {{in}} check.
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