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Posted to mapreduce-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2011/01/15 02:27:46 UTC

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

JvmManager sleeps between SIGTERM and SIGKILL while holding many TT locks
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                 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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