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https://issues.apache.org/jira/browse/YARN-503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13611344#comment-13611344
 ] 

Hadoop QA commented on YARN-503:
--------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12575120/YARN-503.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 tests included appear to have a timeout.{color}

    {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:red}-1 findbugs{color}.  The patch appears to introduce 4 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/581//testReport/
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-YARN-Build/581//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-yarn-server-resourcemanager.html
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/581//console

This message is automatically generated.
                
> DelegationTokens will be renewed forever if multiple jobs share tokens and 
> the first one sets JOB_CANCEL_DELEGATION_TOKEN to false
> ----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-503
>                 URL: https://issues.apache.org/jira/browse/YARN-503
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 0.23.3, 3.0.0, 2.0.0-alpha
>            Reporter: Siddharth Seth
>            Assignee: Daryn Sharp
>         Attachments: YARN-503.patch
>
>
> The first Job/App to register a token is the one which DelegationTokenRenewer 
> associates with a a specific Token. An attempt to remove/cancel these shared 
> tokens by subsequent jobs doesn't work - since the JobId will not match.
> As a result, Even if subsequent jobs have 
> MRJobConfig.JOB_CANCEL_DELEGATION_TOKEN set to true - tokens will not be 
> cancelled when those jobs complete.
> Tokens will eventually be removed from the RM / JT when the service that 
> issued them considers them to have expired or via an explicit 
> cancelDelegationTokens call (not implemented yet in 23).
> A side affect of this is that the same delegation token will end up being 
> renewed multiple times (a separate TimerTask for each job which uses the 
> token).
> DelegationTokenRenewer could maintain a reference count/list of jobIds for 
> shared tokens.

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