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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