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https://issues.apache.org/jira/browse/MAPREDUCE-5911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14176570#comment-14176570
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Ivan Mitic commented on MAPREDUCE-5911:
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Thank you [~jira.shegalov] for bringing this up. You are right, this won't work
with the default partitioner. Sorry I wasn't aware of MAPREDUCE-4879. Let me
take another look and see whether to revert the change that went in or go with
your patch as an addendum.
> Terasort TeraOutputFormat does not check for output directory existance
> -----------------------------------------------------------------------
>
> Key: MAPREDUCE-5911
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5911
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: examples
> Reporter: Ivan Mitic
> Assignee: Bruno P. Kinoshita
> Priority: Minor
> Fix For: 2.6.0
>
> Attachments: HADOOP-5911.patch
>
>
> The enforcement that the directory must not yet exist is implemented in
> {{FileOutputFormat#checkOutputSpecs}} by throwing
> {{FileAlreadyExistsException}}. However, terasort uses a specialized output
> format, {{TeraOutputFormat}}, which is a subclass of {{FileOutputFormat}}.
> The subclass overrides {{checkOutputSpecs}}, but does not re-implement the
> existence check and throw {{FileAlreadyExistsException}}.
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