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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