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https://issues.apache.org/jira/browse/HIVE-1852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971926#action_12971926
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Joydeep Sen Sarma commented on HIVE-1852:
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oh - sorry - my previous comment was wrong. if u rename src to tmpPath - u lose
all previous contents of tmpPath. which is not what the function does - it
retains contents of tmpPath that don't collide with contents in src (the load
command uses this i think and merges data in).
maybe we need a different call for the specific case u are trying to optimize.
if this is not being picked up by the tests - that's pretty bad ..
> Reduce unnecessary DFSClient.rename() calls
> -------------------------------------------
>
> Key: HIVE-1852
> URL: https://issues.apache.org/jira/browse/HIVE-1852
> Project: Hive
> Issue Type: Improvement
> Reporter: Ning Zhang
> Assignee: Ning Zhang
> Attachments: HIVE-1852.patch
>
>
> In Hive client side (MoveTask etc), DFSCleint.rename() is called for every
> file inside a directory. It is very expensive for a large directory in a busy
> DFS namenode. We should replace it with a single rename() call on the whole
> directory.
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