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https://issues.apache.org/jira/browse/HBASE-8475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650221#comment-13650221
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Vasu Mariyala commented on HBASE-8475:
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addDependencyJars function uses Set<String> to hold these tmpjars. As Set
cannot have duplicates, it would probably not ship the same jars multiple
times.
> TableMapReduceUtils#addDependencyJars(Job) shouldn't ship duplicate entries
> in tmpjars
> --------------------------------------------------------------------------------------
>
> Key: HBASE-8475
> URL: https://issues.apache.org/jira/browse/HBASE-8475
> Project: HBase
> Issue Type: Bug
> Components: mapreduce
> Reporter: Nick Dimiduk
>
> *note* this is a hypothesis that needs further investigation.
> Users running the above method in their jobs as a convenience for packaging
> up dependencies will see duplicate entries for jars providing common
> functionality, ie hbase.jar, hadoop.jar, user application jar. For instance,
> if they specify a custom output format and custom partitioner, both in the
> same jar, that jar is resolved via classloader and added to tmpjars twice.
> This imposes a fair amount of pre-job IO (particularly if you jars are fat
> with packed dependencies) and delay job launch accordingly.
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