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https://issues.apache.org/jira/browse/YARN-2539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14144794#comment-14144794
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Hudson commented on YARN-2539:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1905 (See 
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1905/])
YARN-2539. FairScheduler: Set the default value for maxAMShare to 0.5. (Wei Yan 
via kasha) (kasha: rev 43efdd30b52f4ee8967a03dac4d548095d6cafdb)
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/apt/FairScheduler.apt.vm
* hadoop-yarn-project/CHANGES.txt
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/AllocationConfiguration.java
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/TestFairScheduler.java
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/AllocationFileLoaderService.java


> FairScheduler: Set the default value for maxAMShare to 0.5
> ----------------------------------------------------------
>
>                 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
>             Fix For: 2.6.0
>
>         Attachments: YARN-2539-1.patch
>
>
> 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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