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https://issues.apache.org/jira/browse/MAPREDUCE-6577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15064190#comment-15064190
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Jason Lowe commented on MAPREDUCE-6577:
---------------------------------------
And since those won't be expanded, we can probably eliminate the
RELATIVE_LIB_PATH exposure and just have the unit test check if
DEFAULT_MR_AM_ADMIN_USER_ENV appears in the launch context since the values
shouldn't be expanded on the client.
> MR AM unable to load native library without MR_AM_ADMIN_USER_ENV set
> --------------------------------------------------------------------
>
> Key: MAPREDUCE-6577
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6577
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mr-am
> Affects Versions: 2.6.0
> Reporter: Sangjin Lee
> Assignee: Sangjin Lee
> Priority: Critical
> Attachments: MAPREDUCE-6577.01.patch
>
>
> If yarn.app.mapreduce.am.admin.user.env (or yarn.app.mapreduce.am.env) is not
> configured to set LD_LIBRARY_PATH, MR AM will fail to load the native library:
> {noformat}
> 2015-12-15 21:29:22,473 WARN [main] org.apache.hadoop.util.NativeCodeLoader:
> Unable to load native-hadoop library for your platform... using builtin-java
> classes where applicable
> {noformat}
> As a result, any code that needs the hadoop native library in the MR AM will
> fail. For example, an uber-AM with lz4 compression for the mapper task will
> fail:
> {noformat}
> 2015-12-15 21:30:17,575 WARN [uber-SubtaskRunner]
> org.apache.hadoop.mapred.LocalContainerLauncher: Exception running local
> (uberized) 'child' : java.lang.RuntimeException: native lz4 library not
> available
> at
> org.apache.hadoop.io.compress.Lz4Codec.getCompressorType(Lz4Codec.java:125)
> at
> org.apache.hadoop.io.compress.CodecPool.getCompressor(CodecPool.java:148)
> at
> org.apache.hadoop.io.compress.CodecPool.getCompressor(CodecPool.java:163)
> at org.apache.hadoop.mapred.IFile$Writer.<init>(IFile.java:114)
> at org.apache.hadoop.mapred.IFile$Writer.<init>(IFile.java:97)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1602)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1482)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:457)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
> at
> org.apache.hadoop.mapred.LocalContainerLauncher$EventHandler.runSubtask(LocalContainerLauncher.java:391)
> at
> org.apache.hadoop.mapred.LocalContainerLauncher$EventHandler.runTask(LocalContainerLauncher.java:309)
> at
> org.apache.hadoop.mapred.LocalContainerLauncher$EventHandler.access$200(LocalContainerLauncher.java:195)
> at
> org.apache.hadoop.mapred.LocalContainerLauncher$EventHandler$1.run(LocalContainerLauncher.java:238)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
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