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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