[jira] [Commented] (MAPREDUCE-5799) add default value of MR_AM_ADMIN_USER_ENV

["NING DING (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14740384#comment-14740384 ] 

NING DING commented on MAPREDUCE-5799:
--------------------------------------

The parameters yarn.app.mapreduce.am.env and yarn.app.mapreduce.am.admin.user.env are resolved in YARNRunner running on hadoop client host.
But their values, e.g. LD_LIBRARY_PATH=$HADOOP_COMMON_HOME/lib/native, will be used on hadoop cluster hosts.
If the hadoop client host installs hadoop on a different path from that on hadoop cluster hosts, 
the $HADOOP_COMMON_HOME/lib/native will be resolved to a path which is not existed on hadoop cluster hosts.
Then MRAppMaster running on hadoop cluster host cannot load native lib.
To solve this issue, I set my hadoop client's mapred-site.xml with the following content.

{code}
<property>
        <name>yarn.app.mapreduce.am.admin.user.env</name>
        <value>LD_LIBRARY_PATH={{HADOOP_COMMON_HOME}}/lib/native</value>        
</property>
{code}

{noformat}
In this way, the YARNRunner will put LD_LIBRARY_PATH={{HADOOP_COMMON_HOME}}/lib/native into environment. 
The method ContainerLaunch.expandEnvironment running in NodeManager can translate LD_LIBRARY_PATH={{HADOOP_COMMON_HOME}}/lib/native 
to LD_LIBRARY_PATH=$HADOOP_COMMON_HOME/lib/native. 
The host running NodeManager can find its $HADOOP_COMMON_HOME/lib/native path.
{noformat}

I suggest MRJobConfig.DEFAULT_MAPRED_ADMIN_USER_ENV should be defined as below.

{code}
public final String DEFAULT_MAPRED_ADMIN_USER_ENV = 
      Shell.WINDOWS ? 
          "PATH={{PATH}};{{HADOOP_COMMON_HOME}}\\bin":
          "LD_LIBRARY_PATH={{HADOOP_COMMON_HOME}}/lib/native";
{code}

Any ideas?



> add default value of MR_AM_ADMIN_USER_ENV
> -----------------------------------------
>
>                 Key: MAPREDUCE-5799
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5799
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 2.3.0
>            Reporter: Liyin Liang
>            Assignee: Rajesh Kartha
>              Labels: BB2015-05-TBR
>         Attachments: MAPREDUCE-5799-1.diff, MAPREDUCE-5799.002.patch, MAPREDUCE-5799.diff
>
>
> Submit a 1 map + 1 reduce sleep job with the following config:
> {code}
>   <property>
>       <name>mapreduce.map.output.compress</name>
>       <value>true</value>
>   </property>
>   <property>
>       <name>mapreduce.map.output.compress.codec</name>
>       <value>org.apache.hadoop.io.compress.SnappyCodec</value>
>   </property>
> <property>
>   <name>mapreduce.job.ubertask.enable</name>
>   <value>true</value>
> </property>
> {code}
> And the LinuxContainerExecutor is enable on NodeManager.
> This job will fail with the following error:
> {code}
> 2014-03-18 21:28:20,153 FATAL [uber-SubtaskRunner] org.apache.hadoop.mapred.LocalContainerLauncher: Error running local (uberized) 'child' : java.lang.UnsatisfiedLinkError: org.apache.hadoop.util.NativeCodeLoader.buildSupportsSnappy()Z
>         at org.apache.hadoop.util.NativeCodeLoader.buildSupportsSnappy(Native Method)
>         at org.apache.hadoop.io.compress.SnappyCodec.checkNativeCodeLoaded(SnappyCodec.java:63)
>         at org.apache.hadoop.io.compress.SnappyCodec.getCompressorType(SnappyCodec.java:132)
>         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$Writer.<init>(IFile.java:115)
>         at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1583)
>         at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1462)
>         at org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:700)
>         at org.apache.hadoop.mapred.MapTask.closeQuietly(MapTask.java:1990)
>         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:774)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
>         at org.apache.hadoop.mapred.LocalContainerLauncher$SubtaskRunner.runSubtask(LocalContainerLauncher.java:317)
>         at org.apache.hadoop.mapred.LocalContainerLauncher$SubtaskRunner.run(LocalContainerLauncher.java:232)
>         at java.lang.Thread.run(Thread.java:662)
> {code}
> When create a ContainerLaunchContext for task in TaskAttemptImpl.createCommonContainerLaunchContext(), the DEFAULT_MAPRED_ADMIN_USER_ENV which is "LD_LIBRARY_PATH=$HADOOP_COMMON_HOME/lib/native" is added to the environment. Where when create a ContainerLaunchContext for mrappmaster in YARNRunner.createApplicationSubmissionContext(), there is no default environment. So the ubermode job fails to find native lib.



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