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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2131) Aggregate JobCounters and TaskCounters in a background thread
Date Wed, 13 Oct 2010 16:58:31 GMT
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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