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Posted to dev@hive.apache.org by "He Yongqiang (JIRA)" <ji...@apache.org> on 2011/04/21 02:05:06 UTC

[jira] [Resolved] (HIVE-1343) add an interface in RCFile to support concatenation of two files without (de)compression

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

He Yongqiang resolved HIVE-1343.
--------------------------------

    Resolution: Fixed

> 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: Hive
>          Issue Type: New Feature
>          Components: Serializers/Deserializers
>    Affects Versions: 0.6.0
>            Reporter: Ning Zhang
>            Assignee: He Yongqiang
>         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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