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https://issues.apache.org/jira/browse/MAPREDUCE-6454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14707401#comment-14707401
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Allen Wittenauer commented on MAPREDUCE-6454:
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Here's a test you can do to prove my point.
$ echo "HADOOP_CLASSPATH=/tmp" >> $HADOOP_CONF_DIR/hadoop-env.sh
$ hadoop classpath
You should see /tmp
$ HADOOP_CLASSPATH=/etc hadoop classpath
You'll still see /tmp. You won't see /etc. (Well, unless your classpath is
really weird already.)
> MapReduce doesn't set the HADOOP_CLASSPATH for jar lib in distributed cache.
> ----------------------------------------------------------------------------
>
> Key: MAPREDUCE-6454
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6454
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Junping Du
> Assignee: Junping Du
> Priority: Critical
> Fix For: 2.7.2, 2.6.2
>
> Attachments: MAPREDUCE-6454-v2.1.patch, MAPREDUCE-6454-v2.patch,
> MAPREDUCE-6454-v3.1.patch, MAPREDUCE-6454-v3.patch, MAPREDUCE-6454.patch
>
>
> We already set lib jars on distributed-cache to CLASSPATH. However, in some
> corner cases (like: MR local mode, Hive Map side local join, etc.), we need
> these jars on HADOOP_CLASSPATH so hadoop scripts can take it in launching
> runjar process.
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