Wei Yan created YARN-2539:

             Summary: FairScheduler: Update the default value for maxAMShare
                 Key: YARN-2539
                 URL: https://issues.apache.org/jira/browse/YARN-2539
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Wei Yan
            Assignee: Wei Yan
            Priority: Minor

Currently, the maxAMShare per queue is -1 in default, which disables the AM 
share constraint. Change to 0.5f would be good.

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