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From "Joydeep Sen Sarma (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2118) optimize getJobSetupAndCleanupTasks
Date Thu, 02 Dec 2010 23:46:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966349#action_12966349
] 

Joydeep Sen Sarma commented on MAPREDUCE-2118:
----------------------------------------------

Scott - looks like this has been running without glitch on the production cluster for the
last two weeks! So seems safe to review/commit at this point.

> optimize getJobSetupAndCleanupTasks 
> ------------------------------------
>
>                 Key: MAPREDUCE-2118
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2118
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Joydeep Sen Sarma
>            Assignee: Joydeep Sen Sarma
>         Attachments: mapreduce-2118.1.patch
>
>
> in every heartbeat, while holding the JobTracker global lock, all jobs are scanned for
job setup/cleanup, task setup/cleanup. on a large system with many trackers (and heartbeats)
and many jobs - this becomes the bottleneck for JT throughput.
> One possible route may be to rework the code to not require the JT lock while asking
the JIP whether it has a setup/cleanup task. 

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