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https://issues.apache.org/jira/browse/HADOOP-9902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13784883#comment-13784883
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Steve Loughran commented on HADOOP-9902:
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I'd be -1 for any attempt in the shell scripts to try and fix up duplicate JARs.
# inconsistent operation across platforms
# determining which version is latest is non-trivial
# doesn't address the lurker of duplicate classes & resources (log4j,
hdfs-site) on the CP
the JAR has a policy of handling duplicates: first entry first. There is also
the option of sealing JARs without actually signing them -at which point you
get an error when >1 JAR tries to declare classes in the same package. We could
seal the hadoop JARs, but it'd raise more support calls.
What we can do is make sure that there are
* No duplicate JARs get into the default tarball; YARN/lib extends HDFS/lib
extends HADOOP_CORE/lib without conflict.
* No needless JARs (ex, junit 4.10 in YARN/lib)
> Shell script rewrite
> --------------------
>
> Key: HADOOP-9902
> URL: https://issues.apache.org/jira/browse/HADOOP-9902
> Project: Hadoop Common
> Issue Type: Improvement
> Components: scripts
> Affects Versions: 2.1.1-beta
> Reporter: Allen Wittenauer
> Assignee: Allen Wittenauer
> Attachments: hadoop-9902-1.patch, more-info.txt
>
>
> Umbrella JIRA for shell script rewrite. See more-info.txt for more details.
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