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https://issues.apache.org/jira/browse/MAPREDUCE-5708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14525483#comment-14525483
 ] 

Hadoop QA commented on MAPREDUCE-5708:
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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 39s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:red}-1{color} | tests included |   0m  0s | 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. |
| {color:green}+1{color} | javac |   7m 29s | 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 35s | There were no new checkstyle 
issues. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 33s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 32s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   0m 57s | The patch does not introduce 
any new Findbugs (version 2.0.3) warnings. |
| {color:green}+1{color} | mapreduce tests |   9m 12s | Tests passed in 
hadoop-mapreduce-client-app. |
| | |  44m 58s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12621475/0001-Removed-duplicate-String.format.patch
 |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 6ae2a0d |
| hadoop-mapreduce-client-app test log | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5599/artifact/patchprocess/testrun_hadoop-mapreduce-client-app.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5599/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf902.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/5599/console |


This message was automatically generated.

> Duplicate String.format in getSpillFileForWrite
> -----------------------------------------------
>
>                 Key: MAPREDUCE-5708
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5708
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Konstantin Weitz
>            Priority: Minor
>         Attachments: 0001-Removed-duplicate-String.format.patch
>
>   Original Estimate: 10m
>  Remaining Estimate: 10m
>
> The code responsible for formatting the spill file name (namely 
> _getSpillFileForWrite_) unnecessarily calls _String.format_ twice. This does 
> not only affect performance, but leads to the weird requirement that task 
> attempt ids cannot contain _%_ characters (because these would be interpreted 
> as format specifiers in the outside _String.format_ call).
> I assume this was done by mistake, as it could only be useful if task attempt 
> ids contained _%n_.



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