[jira] Commented: (MAPREDUCE-2266) JvmManager sleeps between SIGTERM and SIGKILL while holding many TT locks

["Todd Lipcon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12981998#action_12981998 ] 

Todd Lipcon commented on MAPREDUCE-2266:
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I took a peek at YDH and it looks like the solution used there is to defer the sleep/SIGKILL into a new DelayedProcessKiller thread. But I couldn't find any open source JIRA for this improvement. It would be appreciated if this patch could be contributed - otherwise I'm happy to forward port for trunk.

> JvmManager sleeps between SIGTERM and SIGKILL while holding many TT locks
> -------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2266
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2266
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: task-controller, tasktracker
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Priority: Blocker
>             Fix For: 0.22.0
>
>
> Between sending a task SIGTERM and SIGKILL, the JvmManager will sleep for sleepTimeBeforeSigKill millis. But in many call heirarchies this is done while holding important locks like the TT lock and the JvmManagerForType lock. With the default 5 second sleep, this prevents other tasks from getting scheduled and reduces scheduling throughput.

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