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From "He Yongqiang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1950) Block merge for RCFile
Date Wed, 23 Feb 2011 19:51:38 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998522#comment-12998522
] 

He Yongqiang commented on HIVE-1950:
------------------------------------

A new patch based on trunk and integrated Ning's last comments.

> Block merge for RCFile
> ----------------------
>
>                 Key: HIVE-1950
>                 URL: https://issues.apache.org/jira/browse/HIVE-1950
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: He Yongqiang
>            Assignee: He Yongqiang
>         Attachments: HIVE-1950.1.patch, HIVE-1950.2.patch, HIVE-1950.3.patch, HIVE-1950.4.patch,
HIVE-1950.5.patch
>
>
> In our env, there are a lot of small files inside one partition/table. In order to reduce
the namenode load, we have one dedicated housekeeping job running to merge these file. Right
now the merge is an 'insert overwrite' in hive, and requires decompress the data and compress
it. This jira is to add a command in Hive to do the merge without decompress and recompress
the data.
> Something like "alter table tbl_name [partition ()] merge files". In this jira the new
command will only support RCFile, since there need some new APIs to the fileformat.

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