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https://issues.apache.org/jira/browse/HIVE-1852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973300#action_12973300
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Joydeep Sen Sarma commented on HIVE-1852:
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Ning - do you know why we had the FsShell and -rmr code (in Hive.replaceFiles)
? i don't think it was there originally and there must have been a reason why
it got put in. this patch is taking it out and i wanted to be sure this is ok.
(I am wondering if the -rmr is there to handle non hdfs file systems)
> 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-1852.2.patch, HIVE-1852.3.patch, 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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