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https://issues.apache.org/jira/browse/HADOOP-13786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15705650#comment-15705650
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Steve Loughran commented on HADOOP-13786:
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Looking at the atomic commit problem, I'm starting to worry that I may need
some directory leasing, which would imply a lock field in the table. Just
warning you there. The problem is that while a rename is in progress, you wan't
to stop anything trying to PUT data anywhere under the two paths being worked
on.
> add output committer which uses s3guard for consistent O(1) commits to S3
> -------------------------------------------------------------------------
>
> Key: HADOOP-13786
> URL: https://issues.apache.org/jira/browse/HADOOP-13786
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.0.0-alpha2
> Reporter: Steve Loughran
> Assignee: Steve Loughran
>
> A goal of this code is "support O(1) commits to S3 repositories in the
> presence of failures". Implement it, including whatever is needed to
> demonstrate the correctness of the algorithm. (that is, assuming that s3guard
> provides a consistent view of the presence/absence of blobs, show that we can
> commit directly).
> I consider ourselves free to expose the blobstore-ness of the s3 output
> streams (ie. not visible until the close()), if we need to use that to allow
> us to abort commit operations.
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