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https://issues.apache.org/jira/browse/HADOOP-5889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12718679#action_12718679
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Ian Nowland commented on HADOOP-5889:
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Can do. One question I have is that there exists a
org.apache.hadoop.mapred.TestFileOutputFormat but not a corresponding
org.apache.hadoop.mapreduce.lib.output.TestFileOutputFormat. Should I copy over
the existing test to the new location? Also, should I make my source change in
both the old mapred as well as the newer mapreduce files?
> Allow writing to output directories that exist, as long as they are empty
> -------------------------------------------------------------------------
>
> Key: HADOOP-5889
> URL: https://issues.apache.org/jira/browse/HADOOP-5889
> Project: Hadoop Core
> Issue Type: Improvement
> Components: fs
> Affects Versions: 0.18.3
> Reporter: Ian Nowland
> Fix For: 0.21.0
>
> Attachments: HADOOP-5889-0.patch
>
>
> The current behavior in FileOutputFormat.checkOutputSpecs is to fail if the
> path specified by mapred.output.dir exists at the start of the job. This is
> to protect from accidentally overwriting existing data. There seems no harm
> then in slightly relaxing this check to allow the case for the output to
> exist if it is an empty directory.
> At a minimum this would allow outputting to the root of S3N buckets, which is
> currently impossible (https://issues.apache.org/jira/browse/HADOOP-5805).
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