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From "Rajesh Balamohan (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1495) Reduce locking contention on JobTracker.getTaskCompletionEvents()
Date Mon, 15 Feb 2010 13:05:27 GMT
Reduce locking contention on JobTracker.getTaskCompletionEvents()
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                 Key: MAPREDUCE-1495
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1495
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
    Affects Versions: 0.20.1
            Reporter: Rajesh Balamohan


While profiling JT for slow performance with small-jobs, it was observed that JobTracker.getTaskCompletionEvents()
is attributing to 40% of lock contention on JT.

This JIRA ticket is created to explore the possibilities of reducing the sychronized code
block in this method. 

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