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