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https://issues.apache.org/jira/browse/HADOOP-12252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641782#comment-14641782
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Hadoop QA commented on HADOOP-12252:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  16m 24s | 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 34s | 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 23s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   1m  5s | 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 19s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 33s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   1m 52s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | common tests |  22m 20s | Tests passed in 
hadoop-common. |
| | |  61m 17s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12747211/HADOOP-12252.000.patch 
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 156f24e |
| hadoop-common test log | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/7339/artifact/patchprocess/testrun_hadoop-common.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/7339/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf906.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-HADOOP-Build/7339/console |


This message was automatically generated.

> LocalDirAllocator should not throw NPE with empty string configuration. 
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-12252
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12252
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>         Attachments: HADOOP-12252.000.patch
>
>
> LocalDirAllocator should not throw NPE with empty string configuration. When 
> an empty string is configured, {{LocalDirAllocator}} will throw NPE. It will 
> be better to throw IOException instead of NPE.



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