[jira] [Commented] (YARN-2187) FairScheduler: Disable max-AM-share check by default

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-2187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14039644#comment-14039644 ] 

Hadoop QA commented on YARN-2187:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12651785/YARN-2187.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-YARN-Build/4037//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/4037//console

This message is automatically generated.

> 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
>         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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