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From "Joydeep Sen Sarma (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2118) optimize getJobSetupAndCleanupTasks
Date Fri, 08 Oct 2010 17:02:31 GMT
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


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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