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https://issues.apache.org/jira/browse/YARN-2539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130891#comment-14130891
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Wei Yan commented on YARN-2539:
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YARN-2187 is a temp solution to disable the max am share, because previous the
fair share is the steady fair share. The steady fair share can be very small if
we have many queues. As now we compute max am share with the "dynamic" fair
share, so we reset the default value to a reasonable one.
And, there may be a bug in the maxAMShare calculation. When one queue receives
the first application, its fair share is still 0, which means the queue cannot
accept the AM container. I'm double checking this problem.
> 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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