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https://issues.apache.org/jira/browse/YARN-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14125673#comment-14125673
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Hadoop QA commented on YARN-2494:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12667170/YARN-2494.patch
  against trunk revision 0974f43.

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

    {color:green}+1 tests included{color}.  The patch appears to include 5 new 
or modified test files.

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

    {color:red}-1 javadoc{color}.  The javadoc tool appears to have generated 6 
warning messages.
        See 
https://builds.apache.org/job/PreCommit-YARN-Build/4843//artifact/trunk/patchprocess/diffJavadocWarnings.txt
 for details.

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

    {color:red}-1 findbugs{color}.  The patch appears to introduce 5 new 
Findbugs (version 2.0.3) warnings.

        {color:red}-1 release audit{color}.  The applied patch generated 1 
release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common:

                  org.apache.hadoop.yarn.label.TestFileSystemNodeLabelManager
                  org.apache.hadoop.yarn.label.TestNodeLabelManager

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

Test results: 
https://builds.apache.org/job/PreCommit-YARN-Build/4843//testReport/
Release audit warnings: 
https://builds.apache.org/job/PreCommit-YARN-Build/4843//artifact/trunk/patchprocess/patchReleaseAuditProblems.txt
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-YARN-Build/4843//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-yarn-common.html
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/4843//console

This message is automatically generated.

> [YARN-796] Node label manager API and storage implementations
> -------------------------------------------------------------
>
>                 Key: YARN-2494
>                 URL: https://issues.apache.org/jira/browse/YARN-2494
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-2494.patch
>
>
> This JIRA includes APIs and storage implementations of node label manager,
> NodeLabelManager is an abstract class used to manage labels of nodes in the 
> cluster, it has APIs to query/modify
> - Nodes according to given label
> - Labels according to given hostname
> - Add/remove labels
> - Set labels of nodes in the cluster
> - Persist/recover changes of labels/labels-on-nodes to/from storage
> And it has two implementations to store modifications
> - Memory based storage: It will not persist changes, so all labels will be 
> lost when RM restart
> - FileSystem based storage: It will persist/recover to/from FileSystem (like 
> HDFS), and all labels and labels-on-nodes will be recovered upon RM restart



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