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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2187) FairScheduler: Disable max-AM-share check by default
Date Sat, 21 Jun 2014 14:05:28 GMT

    [ https://issues.apache.org/jira/browse/YARN-2187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14039843#comment-14039843
] 

Hudson commented on YARN-2187:
------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk #1781 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1781/])
YARN-2187. FairScheduler: Disable max-AM-share check by default. (Robert Kanter via kasha)
(kasha: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1604321)
* /hadoop/common/trunk/hadoop-yarn-project/CHANGES.txt
* /hadoop/common/trunk/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/common/trunk/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
* /hadoop/common/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSLeafQueue.java
* /hadoop/common/trunk/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/common/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/apt/FairScheduler.apt.vm


> FairScheduler: Disable max-AM-share check by default
> ----------------------------------------------------
>
>                 Key: YARN-2187
>                 URL: https://issues.apache.org/jira/browse/YARN-2187
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.5.0
>            Reporter: Robert Kanter
>            Assignee: Robert Kanter
>             Fix For: 2.5.0
>
>         Attachments: YARN-2187.patch
>
>
> Say you have a small cluster with 8gb memory and 5 queues.  This means that equal queue
can have 8gb / 5 = 1.6gb but an AM requires 2gb to start so no AMs can be started.  By default,
max-am-share check should be disabled so users don't see a regression. On medium-sized clusters,
it still makes sense to set the max-am-share to a value between 0 and 1. 



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