[jira] [Created] (HADOOP-13843) S3Guard, MetadataStore to support atomic create(path, overwrite=false)

["Steve Loughran (JIRA)" <ji...@apache.org>]

Steve Loughran created HADOOP-13843:
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             Summary: 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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