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Posted to mapreduce-dev@hadoop.apache.org by "Karthik Kambatla (JIRA)" <ji...@apache.org> on 2012/08/06 11:05:02 UTC

[jira] [Created] (MAPREDUCE-4518) FairScheduler: PoolSchedulable#updateDemand() - potential redundant aggregation

Karthik Kambatla created MAPREDUCE-4518:
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             Summary: FairScheduler: PoolSchedulable#updateDemand() - potential redundant aggregation
                 Key: MAPREDUCE-4518
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4518
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: contrib/fair-share
    Affects Versions: 1.0.3
            Reporter: Karthik Kambatla
            Assignee: Karthik Kambatla


In FS, PoolSchedulable#updateDemand() limits the demand to maxTasks only after iterating though all the pools and computing the final demand. 

By checking if the demand has reached maxTasks in every iteration, we can avoid redundant work, at the expense of one condition check every iteration.

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