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https://issues.apache.org/jira/browse/SPARK-13628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15177512#comment-15177512
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Sean Owen commented on SPARK-13628:
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I don't think that's a good idea in general, because you leave the file in its
final location while it's still being written. The rename is on purpose.
> Temporary intermediate output file should be renamed before copying to
> destination filesystem
> ---------------------------------------------------------------------------------------------
>
> Key: SPARK-13628
> URL: https://issues.apache.org/jira/browse/SPARK-13628
> Project: Spark
> Issue Type: Improvement
> Components: Input/Output
> Affects Versions: 1.6.0
> Reporter: Chen He
>
> Spark Executor will dump temporary file into local temp dir, copy it to
> destination filesystem, and then, rename it. It could be costly for Blobstore
> (such as openstack swift) which do the actual copy when file is renamed. If
> it does not affect other components, we may switch the sequence of copy and
> rename so that Spark can use Blobstore as final output destination.
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