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https://issues.apache.org/jira/browse/HADOOP-6670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12889385#action_12889385
 ] 

Hadoop QA commented on HADOOP-6670:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12449720/c6670-03.patch
  against trunk revision 964939.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 6 new or modified tests.

    -1 javadoc.  The javadoc tool appears to have generated 1 warning messages.

    +1 javac.  The applied patch does not increase the total number of javac 
compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of 
release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: 
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/620/testReport/
Findbugs warnings: 
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/620/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: 
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/620/artifact/trunk/build/test/checkstyle-errors.html
Console output: 
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/620/console

This message is automatically generated.

> UserGroupInformation doesn't support use in hash tables
> -------------------------------------------------------
>
>                 Key: HADOOP-6670
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6670
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>         Attachments: 6670-gridmix-test.bugfix.patch, c6670-02.patch, 
> c6670-03.patch, fs-close.patch, fs-close.patch, fs-close.patch
>
>
> The UserGroupInformation objects are mutable, but they are used as keys in 
> hash tables. This leads to serious problems in the FileSystem cache and RPC 
> connection cache. We need to change the hashCode to be the identity hash code 
> of the Subject and change equals to use == between the Subjects.

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