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https://issues.apache.org/jira/browse/HIVE-18206?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HIVE-18206 started by Wang Haihua.
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> Merge of RC/ORC file should follow other fileformate which use merge
> configuration parameter
> --------------------------------------------------------------------------------------------
>
> Key: HIVE-18206
> URL: https://issues.apache.org/jira/browse/HIVE-18206
> Project: Hive
> Issue Type: New Feature
> Reporter: Wang Haihua
> Assignee: Wang Haihua
>
> Merge configuration parameter, like {{hive.merge.size.per.task}} , decide the
> average file after merge stage.
> But we found it only work for file format like {{Textfile/SequenceFile}}.
> With {{RC/ORC}} file format, it {{does not work}}.
> For {{RC/ORC}} file format, we found instead the file size after merge stage,
> depends on parameter like {{mapreduce.input.fileinputformat.split.maxsize}.
> it is better to use {{hive.merge.size.per.task}} to decide the the average
> file size for RC/ORC fileformat, which results in unifying.
> Root Cause is for RC/ORC file format, merge class is {{MergeFileTask}}
> instead of {{MapRedTask}} for Textfile/SequenceFile. And {{MergeFileTask}}
> just has not accept the configuration value in MergeFileWork, so the solution
> is passing it into {{MergeFileTask}}
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