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https://issues.apache.org/jira/browse/HADOOP-15469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479174#comment-16479174
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Steve Loughran commented on HADOOP-15469:
-----------------------------------------

Risk of change? only if you execute a job where at job setup all was good and 
yet at job complete something not _temporary has arrived. Its just a safety 
check , but one which isn't handling things. 

If we wanted to retain it, you could do something like
if (exists(dest)) ls dest, filter out temp _* and .* files then fail iff the 
filtered list is non-empty

> S3A directory committer commit job fails if _temporary directory created 
> under dest
> -----------------------------------------------------------------------------------
>
>                 Key: HADOOP-15469
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15469
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.1.0
>         Environment: spark test runs
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>         Attachments: HADOOP-15469-001.patch
>
>
> The directory staging committer fails in commit job if any temporary 
> files/dirs have been created. Spark work can create such a dir for placement 
> of absolute files.
> This is because commitJob() looks for the dest dir existing, not containing 
> non-hidden files.
> As the comment says, "its kind of superfluous". More specifically, it means 
> jobs which would commit with the classic committer & overwrite=false will fail
> Proposed fix: remove the check



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