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https://issues.apache.org/jira/browse/MAPREDUCE-311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14070802#comment-14070802
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Allen Wittenauer commented on MAPREDUCE-311:
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It's likely too late to change hadoop.tmp.dir. But this is still an issue.
Debating opening a new JIRA that states the problem but not a solution so that
hadoop.tmp.dir is left alone.
> JobClient should use multiple volumes as hadoop.tmp.dir
> -------------------------------------------------------
>
> Key: MAPREDUCE-311
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-311
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Environment: All
> Reporter: Milind Bhandarkar
>
> Currently, hadoop.tmp.dir configuration variable allows specification of only
> a single directory to be used as scratch space. In particular, on the job
> launcher nodes with multiple volumes, this fails the entire job if the
> tmp.dir is somehow unusable. When the job launcher nodes have multiple
> volumes, the tmp space availability can be improved by using multiple volumes
> (either randomly or in round-robin.) The code for choosing a volume from a
> comma-separated list of multiple volumes is already there for
> mapred.local.dir etc. That needs to be used by job client as well.
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