[MAPREDUCE-5451] MR uses LD_LIBRARY_PATH which doesn't mean anything in Windows

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.1-beta, 3.0.0-alpha1
• Fix Version/s: 2.3.0

Environment

Windows

• Target Version/s: 2.3.0
• Hadoop Flags: Reviewed
• Assignee: Yingda Chen
• Reporter: Mostafa Elhemali
• Created: 30/May/13 00:08
• Updated: 12/May/16 18:22
• Resolved: 06/Nov/13 18:24

Description

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:

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)

Issue Links

• breaks: MAPREDUCE-5642 TestMiniMRChildTask fails on Windows
• is part of: MAPREDUCE-4401 Enhancements to MapReduce for Windows Server and Windows Azure development and runtime environments
• is related to: HADOOP-11285 FileUtil operations don't check for native lib loaded on windows
• is related to: YARN-1025 ResourceManager and NodeManager do not load native libraries on Windows.
• relates to: MAPREDUCE-5442 $HADOOP_MAPRED_HOME/$HADOOP_CONF_DIR setting not working on Windows