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https://issues.apache.org/jira/browse/HIVE-1852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973387#action_12973387
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Joydeep Sen Sarma commented on HIVE-1852:
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regarding wildcards - load data inpath /x/*.txt - does that work? the copy task
should not happen if the source and destination file systems are the same (in
the load command). i think u may have observed the copy command kick in because
in the hive unit test environment - the default file system is pfile:// and
local file system is not same as pfile:// (from a java class standpoint). so
copytask kicks in. you might want to try a load command without the 'local'
keyword.
also - regarding the question about filesystem.delete versus fsshell - testing
should be easy because we have two working file systems in our test environment
(file:// and pfile://). we can create a partition pointing to one filesystem
and then try to change it's location to the other filesystem and make sure
things work.
> 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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