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https://issues.apache.org/jira/browse/MAPREDUCE-2266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13109114#comment-13109114
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Todd Lipcon commented on MAPREDUCE-2266:
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This is a bug in DefaultTaskController - you're going to want to include it, or
else MR performance will have a giant regression.
> 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
> 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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