Aggregate JobCounters and TaskCounters in a background thread
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Key: MAPREDUCE-2131
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2131
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: jobtracker
Affects Versions: 0.22.0
Reporter: Scott Chen
Fix For: 0.22.0
JobTracker.getJobCounters() aggregates the counters when getting requested.
It may consume lots of CPU if the request is too often.
It may be good if we aggregate them in a background thread.
Thoughts?
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