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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6188) Fix OOM issue with decommissioningNodesWatcher in the case of clusters with large number of nodes
Date Tue, 14 Feb 2017 18:48:41 GMT

    [ https://issues.apache.org/jira/browse/YARN-6188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15866380#comment-15866380
] 

Hadoop QA commented on YARN-6188:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue}
Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  7s{color} | {color:red}
YARN-6188 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | YARN-6188 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12852629/YARN-6188.001.patch
|
| Console output | https://builds.apache.org/job/PreCommit-YARN-Build/14938/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Fix OOM issue with decommissioningNodesWatcher in the case of clusters with large number
of nodes
> -------------------------------------------------------------------------------------------------
>
>                 Key: YARN-6188
>                 URL: https://issues.apache.org/jira/browse/YARN-6188
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.9.0
>            Reporter: Ajay Jadhav
>             Fix For: 2.9.0, 3.0.0-alpha1
>
>         Attachments: YARN-6188.001.patch
>
>
> LogDecommissioningNodesStatus method in DecommissioningNodesWatcher uses StringBuilder
to append status of all
> decommissioning nodes for logging purpose.
> In the case of large number of decommissioning nodes, this leads to OOM exception. The
fix scopes StringBuilder so that in case of memory pressure, GC can kick in and free up the
memory.
> This is supposed to fix a bug introduced in https://issues.apache.org/jira/browse/YARN-4676



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