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https://issues.apache.org/jira/browse/MAPREDUCE-6361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14539726#comment-14539726
 ] 

Hadoop QA commented on MAPREDUCE-6361:
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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 57s | 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 37s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |   9m 41s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 22s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   0m 45s | There were no new checkstyle 
issues. |
| {color:red}-1{color} | whitespace |   0m  0s | The patch has 9  line(s) that 
end in whitespace. Use git apply --whitespace=fix. |
| {color:green}+1{color} | install |   1m 33s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 34s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   1m 13s | The patch does not introduce 
any new Findbugs (version 2.0.3) warnings. |
| {color:green}+1{color} | mapreduce tests |   1m 36s | Tests passed in 
hadoop-mapreduce-client-core. |
| | |  38m 22s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12732215/MAPREDUCE-6361-v1.patch
 |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 8badd82 |
| whitespace | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5714/artifact/patchprocess/whitespace.txt
 |
| hadoop-mapreduce-client-core test log | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5714/artifact/patchprocess/testrun_hadoop-mapreduce-client-core.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5714/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf903.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/5714/console |


This message was automatically generated.

> NPE issue in shuffle caused by concurrent issue between copySucceeded() in 
> one thread and copyFailed() in another thread on the same host
> -----------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6361
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6361
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Junping Du
>            Assignee: Junping Du
>            Priority: Critical
>         Attachments: MAPREDUCE-6361-v1.patch
>
>
> The failure in log:
> 2015-05-08 21:00:00,513 WARN [main] org.apache.hadoop.mapred.YarnChild: 
> Exception running child : 
> org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in 
> shuffle in fetcher#25
>          at 
> org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:134)
>          at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:376)
>          at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163)
>          at java.security.AccessController.doPrivileged(Native Method)
>          at javax.security.auth.Subject.doAs(Subject.java:415)
>          at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
>          at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
> Caused by: java.lang.NullPointerException
>          at 
> org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl.copyFailed(ShuffleSchedulerImpl.java:267)
>          at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:308)
>          at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:193)



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