[jira] [Created] (YARN-8706) DelayedProcessKiller is executed for Docker containers even though docker stop sends a KILL signal after the specified grace period

["Chandni Singh (JIRA)" <ji...@apache.org>]

Chandni Singh created YARN-8706:
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             Summary: DelayedProcessKiller is executed for Docker containers even though docker stop sends a KILL signal after the specified grace period
                 Key: YARN-8706
                 URL: https://issues.apache.org/jira/browse/YARN-8706
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Chandni Singh
            Assignee: Chandni Singh


{{DockerStopCommand}} adds a grace period of 10 seconds.

10 seconds is also the default grace time use by docker stop
 [https://docs.docker.com/engine/reference/commandline/stop/]

Documentation of the docker stop:
{quote}the main process inside the container will receive {{SIGTERM}}, and after a grace period, {{SIGKILL}}.
{quote}
There is a {{DelayedProcessKiller}} in {{ContainerExcecutor}} which executes for all containers after a delay when {{sleepDelayBeforeSigKill>0}}. By default this is set to {{250 milliseconds}} and so irrespective of the container type, it will get always get executed.
 
For a docker container, {{docker stop}} takes care of sending a {{SIGKILL}} after the grace period, so having {{DelayedProcessKiller}} seems redundant.



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