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https://issues.apache.org/jira/browse/MESOS-3479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14902379#comment-14902379
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Jan Schlicht commented on MESOS-3479:
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Not much to refine here, thanks to the great description of the behavior.
The return code of the command that is executed by the health check is used to
determine whether the check was successful or not. If the timeout is exceeded
before the command is finished, the health check process ends itself. The
command may still be running.
> COMMAND Health Checks are not executed if the timeout is exceeded
> -----------------------------------------------------------------
>
> Key: MESOS-3479
> URL: https://issues.apache.org/jira/browse/MESOS-3479
> Project: Mesos
> Issue Type: Bug
> Affects Versions: 0.23.0
> Reporter: Matthias Veit
> Priority: Critical
>
> The issue first appeared as Marathon Bug: See here for reference:
> https://github.com/mesosphere/marathon/issues/2179.
> A COMMAND health check is defined with a timeout of 20 seconds.
> The command itself takes longer than 20 seconds to execute.
> Current behavior:
> - The mesos health check process get's killed, but the defined command
> process not (in the example the curl command returns after 21 seconds).
> - The check attempt is considered healthy, if the timeout is exceeded
> - The health check stops and is not executed any longer
> Expected behavior:
> - The defined health check command is killed, when the timeout is exceeded
> - The check attempt is considered Unhealthy, if the timeout is exceeded
> - The health check does not stop
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