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https://issues.apache.org/jira/browse/MAPREDUCE-5225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14525392#comment-14525392
 ] 

Hadoop QA commented on MAPREDUCE-5225:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  14m 36s | 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 31s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |   9m 32s | 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 |   1m 22s | 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 33s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   1m 54s | The patch does not introduce 
any new Findbugs (version 2.0.3) warnings. |
| {color:green}+1{color} | mapreduce tests |   1m 34s | Tests passed in 
hadoop-mapreduce-client-core. |
| {color:green}+1{color} | mapreduce tests | 108m 31s | Tests passed in 
hadoop-mapreduce-client-jobclient. |
| | | 147m 31s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12582421/MAPREDUCE-5225.1.patch 
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / f1a152c |
| hadoop-mapreduce-client-core test log | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5589/artifact/patchprocess/testrun_hadoop-mapreduce-client-core.txt
 |
| hadoop-mapreduce-client-jobclient test log | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5589/artifact/patchprocess/testrun_hadoop-mapreduce-client-jobclient.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5589/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/5589/console |


This message was automatically generated.

> SplitSampler in mapreduce.lib should use a SPLIT_STEP to jump around splits
> ---------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5225
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5225
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>         Attachments: MAPREDUCE-5225.1.patch
>
>
> Now, SplitSampler only samples the first maxSplitsSampled splits, caused by 
> MAPREDUCE-1820. However, jumping around all splits is in general preferable 
> than the first N splits.



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