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Date: Tue, 5 Jan 2016 21:36:40 +0000 (UTC)
From: "Sangjin Lee (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Message-ID: <JIRA.12922612.1450334790000.26412.1452029800021@Atlassian.JIRA>
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 <JIRA.12922612.1450334790517@arcas>
Subject: [jira] [Commented] (MAPREDUCE-6577) MR AM unable to load native
 library without MR_AM_ADMIN_USER_ENV set
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-6577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15083856#comment-15083856 ] 

Sangjin Lee commented on MAPREDUCE-6577:
----------------------------------------

Thanks [~cnauroth]! [~jlowe], do let me know if you're +1 on the latest patch. I can commit it then.

> 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, MAPREDUCE-6577.02.patch, MAPREDUCE-6577.03.patch, MAPREDUCE-6577.04.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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