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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2266) JvmManager sleeps between SIGTERM and SIGKILL while holding many TT locks
Date Sat, 01 Oct 2011 00:21:45 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13118593#comment-13118593
] 

Todd Lipcon commented on MAPREDUCE-2266:
----------------------------------------

There's no patch, since this was dealt with by MAPREDUCE-2178 where JvmManager was substantially
rewritten. I can't contribute time to the 0.22 release, since I'm concentrating on 0.23 and
0.20.20x release lines.
                
> 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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