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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5889) Allow writing to output directories that exist, as long as they are empty
Date Thu, 11 Jun 2009 18:17:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12718574#action_12718574
] 

Tom White commented on HADOOP-5889:
-----------------------------------

This looks good to me. Would it be possible to have a unit test?

> 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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