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https://issues.apache.org/jira/browse/YARN-1321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13809416#comment-13809416
 ] 

Hadoop QA commented on YARN-1321:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12611114/YARN-1321.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 2 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}.  The javadoc tool did not generate any 
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-client.

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

Test results: 
https://builds.apache.org/job/PreCommit-YARN-Build/2318//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/2318//console

This message is automatically generated.

> NMTokenCache is a singleton, prevents multiple AMs running in a single JVM to 
> work correctly
> --------------------------------------------------------------------------------------------
>
>                 Key: YARN-1321
>                 URL: https://issues.apache.org/jira/browse/YARN-1321
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 2.2.0
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>            Priority: Blocker
>         Attachments: YARN-1321-20131029.txt, YARN-1321.patch, 
> YARN-1321.patch, YARN-1321.patch, YARN-1321.patch, YARN-1321.patch, 
> YARN-1321.patch
>
>
> NMTokenCache is a singleton. Because of this, if running multiple AMs in a 
> single JVM NMTokens for the same node from different AMs step on each other 
> and starting containers fail due to mismatch tokens.
> The error observed in the client side is something like:
> {code}
> ERROR org.apache.hadoop.security.UserGroupInformation: 
> PriviledgedActionException as:llama (auth:PROXY) via llama (auth:SIMPLE) 
> cause:org.apache.hadoop.yarn.exceptions.YarnException: Unauthorized request 
> to start container. 
> NMToken for application attempt : appattempt_1382038445650_0002_000001 was 
> used for starting container with container token issued for application 
> attempt : appattempt_1382038445650_0001_000001
> {code}



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