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From "He Yongqiang (JIRA)" <>
Subject [jira] Created: (HIVE-1950) Block merge for RCFile
Date Thu, 03 Feb 2011 18:41:29 GMT
Block merge for RCFile

                 Key: HIVE-1950
             Project: Hive
          Issue Type: New Feature
            Reporter: He Yongqiang
            Assignee: He Yongqiang

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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