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Posted to mapreduce-issues@hadoop.apache.org by "Allen Wittenauer (JIRA)" <ji...@apache.org> on 2011/05/12 00:17:47 UTC
[jira] [Commented] (MAPREDUCE-2485) reinitialize CLASSPATH variable
when executing Mapper/Reducer code
[ 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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