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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5451) MR uses LD_LIBRARY_PATH which doesn't mean anything in Windows
Date Wed, 25 Sep 2013 18:40:05 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13777884#comment-13777884
] 

Chris Nauroth commented on MAPREDUCE-5451:
------------------------------------------

Just one minor thing: can we please correct this typo in {{TestMiniMRChildTask}}?

{code}
      // Ensure execution PATH/LD_LIBRATY_PAH set up pointing to hadoop lib
{code}

+1 for the patch after that is addressed.

[~vinodkv], does it look good to you?

                
> MR uses LD_LIBRARY_PATH which doesn't mean anything in Windows
> --------------------------------------------------------------
>
>                 Key: MAPREDUCE-5451
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5451
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 2.1.1-beta
>         Environment: Windows
>            Reporter: Mostafa Elhemali
>            Assignee: Yingda Chen
>         Attachments: MAPREDUCE-5451-2.patch, MAPREDUCE-5451-3.patch, MAPREDUCE-5451-4.patch,
MAPREDUCE-5451-5.patch, MAPREDUCE-5451.patch, YARN-729.patch
>
>
> In order to set the path for loading native libraries, MR relies on the default value
of the mapreduce.admin.user.env configuration setting the LD_LIBRARY_PATH environment entry.
There are two problems with this setting in Windows:
> a) LD_LIBRARY_PATH doesn't mean anything in Windows.
> b) It sets it using $HADOOP_COMMON_HOME, instead of %HADOOP_COMMON_HOME%.
> The default value here should be platform-dependent (use the PATH variable in Windows
instead of LD_LIBRARY_PATH), or we should rely on another mechanism. The net effect is that
in Windows unless this configuration is over-ridden MR jobs fail with this error:
> {code}
> 2013-05-29 13:51:41,049 FATAL [main] org.apache.hadoop.mapred.YarnChild: Error running
child : java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Ljava/lang/String;I)Z
> 	at org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Native Method)
> 	at org.apache.hadoop.io.nativeio.NativeIO$Windows.access(NativeIO.java:393)
> 	at org.apache.hadoop.fs.FileUtil.canRead(FileUtil.java:928)
> 	at org.apache.hadoop.util.DiskChecker.checkAccessByFileMethods(DiskChecker.java:177)
> 	at org.apache.hadoop.util.DiskChecker.checkDirAccess(DiskChecker.java:164)
> 	at org.apache.hadoop.util.DiskChecker.checkDir(DiskChecker.java:98)
> 	at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.confChanged(LocalDirAllocator.java:288)
> 	at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathToRead(LocalDirAllocator.java:431)
> 	at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathToRead(LocalDirAllocator.java:164)
> 	at org.apache.hadoop.mapred.YarnChild.configureLocalDirs(YarnChild.java:235)
> 	at org.apache.hadoop.mapred.YarnChild.configureTask(YarnChild.java:294)
> 	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:143)
> {code}

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