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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2485) reinitialize CLASSPATH variable when executing Mapper/Reducer code
Date Wed, 11 May 2011 22:17:47 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032122#comment-13032122
] 

Allen Wittenauer commented on MAPREDUCE-2485:
---------------------------------------------

What happens if CLASSPATH is pushed into mapred.child.env?

> reinitialize CLASSPATH variable when executing Mapper/Reducer code
> ------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2485
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2485
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: pipes
>    Affects Versions: 0.20.2
>         Environment: Ubuntu 10.04 LTS
>            Reporter: Tom Melendez
>
> We're using pipes, and using libhdfs inside our mapper and reducer code.  We've determined
that we need to execute a putenv call in order for libhdfs to actually have access to the
CLASSPATH.  Ideally, it should just use the CLASSPATH we set when the job was executed.
> For some more context, see these threads:
> https://groups.google.com/a/cloudera.org/group/cdh-user/browse_thread/thread/ae9808d80fb132fb?tvc=2
> http://comments.gmane.org/gmane.comp.jakarta.lucene.hadoop.user/25830

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