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From "Mostafa Elhemali (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-729) MR uses LD_LIBRARY_PATH which doesn't mean anything in Windows
Date Thu, 30 May 2013 00:08:20 GMT
Mostafa Elhemali created YARN-729:
-------------------------------------

             Summary: MR uses LD_LIBRARY_PATH which doesn't mean anything in Windows
                 Key: YARN-729
                 URL: https://issues.apache.org/jira/browse/YARN-729
             Project: Hadoop YARN
          Issue Type: Bug
    Affects Versions: 3.0.0
         Environment: Windows
            Reporter: Mostafa Elhemali


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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