hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1852) Reduce unnecessary DFSClient.rename() calls
Date Thu, 16 Dec 2010 00:51:03 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971908#action_12971908
] 

Hairong Kuang commented on HIVE-1852:
-------------------------------------

Joydeep is right. I did not realize that you try to merge multiple source directories into
one.

> 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. 

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message