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https://issues.apache.org/jira/browse/HIVE-1852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971991#action_12971991
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Joydeep Sen Sarma commented on HIVE-1852:
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what happens when there are multiple srcs:
srcs = fs.listStatus(srcf);
for (FileStatus src : srcs) {
if (!fs.rename(src.getPath(), tmppath)) {
we can't rename multiple sources to the same target. this happens when the
input path is a glob (which i think the load command allows).
can we special case this optimization (apply only when srcs.length == 1)?
> 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.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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