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https://issues.apache.org/jira/browse/HADOOP-5889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved HADOOP-5889.
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Resolution: Incomplete
I'm just going to close this as stale, esp given s3 allegedly works.
> 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 Common
> Issue Type: Improvement
> Components: fs
> Affects Versions: 0.18.3
> Reporter: Ian Nowland
> 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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