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From "He Yongqiang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-1343) add an interface in RCFile to support concatenation of two files without (de)compression
Date Fri, 14 May 2010 15:25:42 GMT

     [ https://issues.apache.org/jira/browse/HIVE-1343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

He Yongqiang updated HIVE-1343:
-------------------------------

    Attachment: HIVE-1343.1.patch

> add an interface in RCFile to support concatenation of two files without (de)compression
> ----------------------------------------------------------------------------------------
>
>                 Key: HIVE-1343
>                 URL: https://issues.apache.org/jira/browse/HIVE-1343
>             Project: Hadoop Hive
>          Issue Type: New Feature
>    Affects Versions: 0.6.0
>            Reporter: Ning Zhang
>            Assignee: He Yongqiang
>             Fix For: 0.6.0
>
>         Attachments: HIVE-1343.1.patch
>
>
> If two files are concatenated, we need to read each record in these files and write them
back to the destination file. The IO cost is mostly unavoidable due to the lack of append
functionality in HDFS. However the CPU cost could be significantly reduced by avoiding compression
and decompression of the files.
> The File Format layer should provide API that implement the block-level concatenation.


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