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https://issues.apache.org/jira/browse/HADOOP-13843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16082190#comment-16082190
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Steve Loughran commented on HADOOP-13843:
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I'm not sure we can/should do this
> S3Guard, MetadataStore to support atomic create(path, overwrite=false)
> ----------------------------------------------------------------------
>
> Key: HADOOP-13843
> URL: https://issues.apache.org/jira/browse/HADOOP-13843
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.0.0-alpha2
> Reporter: Steve Loughran
>
> Support atomically enforced file creation. Current s3a can do a check in
> create() and fail if there is something there, but a new entry only gets
> created at the end of the PUT; during the entire interval between that check
> and the close() of the stream, there's nothing to stop other callers creating
> an object.
> Proposed: s3afs can do a check + create a 0 byte file at the path; that'd
> need some {{putNoOverwrite(DirListingMetadata)}} call in MetadataStore,
> followed by a PUT of an 0-byte file to S3. That will increase cost of file
> creation, though at least with the MD store, the cost of the initial
> getFileStatus() check is down.
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