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From "Ning Zhang (JIRA)" <>
Subject [jira] Commented: (HIVE-1852) Reduce unnecessary DFSClient.rename() calls
Date Mon, 20 Dec 2010 22:13:01 GMT


Ning Zhang commented on HIVE-1852:

Yongqiang, do you have the command/script that can reproduce the use case there oldPath is
from a different FS? Theoretically using FsShell and FileSystem.delete should be the same
(FsShell should internally call FileSystem.delete).  Did you get a new file system from oldPath
or use the same from other paths?

> Reduce unnecessary DFSClient.rename() calls
> -------------------------------------------
>                 Key: HIVE-1852
>                 URL:
>             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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