Improve the way Counters are managed by JobTracker
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Key: MAPREDUCE-1500
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1500
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: jobtracker
Reporter: Amar Kamat
Counters typically eat up a considerable amount of JobTracker's heap space.
There is also a considerable heap space wastage due to duplicate Strings in
Counters. Some amount of Counters' storage optimization can help reduce the
load on JobTracker's memory.
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