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https://issues.apache.org/jira/browse/FLINK-12003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16801737#comment-16801737
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Timo Walther commented on FLINK-12003:
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Sorry, I did this a long time ago. Cannot remember the reason anymore.
> Revert the config option about mapreduce.output.basename in
> HadoopOutputFormatBase
> ----------------------------------------------------------------------------------
>
> Key: FLINK-12003
> URL: https://issues.apache.org/jira/browse/FLINK-12003
> Project: Flink
> Issue Type: Improvement
> Components: Connectors / Hadoop Compatibility
> Reporter: vinoyang
> Assignee: vinoyang
> Priority: Major
>
> In {{HadoopOutputFormatBase}} open method, the config option
> {{mapreduce.output.basename}} was changed to "tmp" and there is not any
> documentation state this change.
> By default, HDFS will use this format "part-x-yyyyy" to name its file, the x
> and y means :
> * {{x}} is either 'm' or 'r', depending on whether the job was a map only
> job, or reduce
> * {{yyyyy}} is the mapper or reducer task number (zero based)
>
> The keyword "part" has used in many place in user's business logic to match
> the hdfs's file name. So I suggest to revert this config option or document
> it.
>
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