[jira] [Work started] (HIVE-18206) Merge of RC/ORC file should follow other fileformate which use merge configuration parameter

["Wang Haihua (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-18206?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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