[jira] [Commented] (HIVE-1950) Block merge for RCFile

["Lefty Leverenz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-1950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14174764#comment-14174764 ] 

Lefty Leverenz commented on HIVE-1950:
--------------------------------------

Doc note:  [~prasanth_j] documented this in the wiki here:

* [DDL -- Alter Table/Partition Concatenate | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-AlterTable/PartitionConcatenate]

> 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
>             Fix For: 0.8.0
>
>         Attachments: HIVE-1950.1.patch, HIVE-1950.2.patch, HIVE-1950.3.patch, HIVE-1950.4.patch, HIVE-1950.5.patch, HIVE-1950.6.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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