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From "Ian Nowland (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5889) Allow writing to output directories that exist, as long as they are empty
Date Thu, 21 May 2009 23:09:47 GMT
Allow writing to output directories that exist, as long as they are empty
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                 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


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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