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https://issues.apache.org/jira/browse/MAPREDUCE-5905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14526260#comment-14526260
 ] 

Hadoop QA commented on MAPREDUCE-5905:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  14m 37s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to 
include 1 new or modified test files. |
| {color:green}+1{color} | javac |   7m 30s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |   9m 35s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 23s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   0m 47s | There were no new checkstyle 
issues. |
| {color:red}-1{color} | whitespace |   0m  0s | The patch has 1  line(s) that 
end in whitespace. Use git apply --whitespace=fix. |
| {color:green}+1{color} | install |   1m 35s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 32s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   1m 16s | The patch does not introduce 
any new Findbugs (version 2.0.3) warnings. |
| {color:green}+1{color} | mapreduce tests |   1m 42s | Tests passed in 
hadoop-mapreduce-client-core. |
| | |  38m  0s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12646838/MAPREDUCE-5905.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / a319771 |
| whitespace | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5631/artifact/patchprocess/whitespace.txt
 |
| hadoop-mapreduce-client-core test log | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5631/artifact/patchprocess/testrun_hadoop-mapreduce-client-core.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5631/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf905.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP 
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5631/console |


This message was automatically generated.

> CountersStrings.toEscapedCompactStrings outputs unnecessary "null" strings
> --------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5905
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5905
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.4.0, 2.7.0
>            Reporter: Akira AJISAKA
>            Assignee: Akira AJISAKA
>            Priority: Minor
>         Attachments: MAPREDUCE-5905.patch
>
>
> CountersStrings.toEscapedCompactStrings outputs "null" strings if a 
> CounterGroup has more than one Counter.
> That way there are some "null" strings in MRv1(CDH) job history log.
> https://issues.cloudera.org/browse/DISTRO-598



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