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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1797) The JobTracker lock can be a reader/writer lock
Date Tue, 18 May 2010 22:08:43 GMT
The JobTracker lock can be a reader/writer lock
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                 Key: MAPREDUCE-1797
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1797
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: jobtracker
            Reporter: dhruba borthakur


The Jobtracker has a global lock and a per-job JobInProgress lock. The aim for the JobInprogress
lock is to support the ability to lock a single job's metadata without  blocking out the entire
JobTracker. However, many code paths acquire the JobTracker lock and then acquire the JobInProgress
lock while keeping the JobTracker lock. This somewhat defeats the benefit of having a per-job
lock.

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