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https://issues.apache.org/jira/browse/HADOOP-6800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881847#action_12881847
 ] 

Hadoop QA commented on HADOOP-6800:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12447851/HADOOP-6800.patch
  against trunk revision 957074.

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

    -1 tests included.  The patch doesn't appear to include any new or modified 
tests.
                        Please justify why no new tests are needed for this 
patch.
                        Also please list what manual steps were performed to 
verify this patch.

    -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/593/testReport/
Findbugs warnings: 
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/593/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: 
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/593/artifact/trunk/build/test/checkstyle-errors.html
Console output: 
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/593/console

This message is automatically generated.

> Harmonize JAR library versions
> ------------------------------
>
>                 Key: HADOOP-6800
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6800
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Tom White
>            Assignee: Tom White
>            Priority: Blocker
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-6800.patch, HADOOP-6800.patch, HADOOP-6800.patch
>
>
> Currently, multiple versions of the same library JAR are being pulled in for 
> various reasons.
> * Within the same project, multiple versions of the same JAR are pulled in. 
> E.g. Avro (used by Common) depends on Commons Lang 2.5 while Common depends 
> on Commons Lang 2.4.
> * Dependent subprojects use different versions. E.g. Common depends on Avro 
> 1.3.2 while MapReduce depends on 1.3.0. Since MapReduce depends on Common, 
> this has the potential to cause a problem at runtime.

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