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https://issues.apache.org/jira/browse/HADOOP-13786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16052550#comment-16052550
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Aaron Fabbri commented on HADOOP-13786:
---------------------------------------

Rebased v30 patch onto latest feature branch (shout if you want me to post the 
rebased patch). Ran ITestS3ACommit* successfully.  Reading through the latest 
patch and playing with the code some.

qq: Should we have some test assumptions that s3guard is enabled for 
ITestS3ACommitActions, or is it useful to test w/o S3Guard?

[~ste...@apache.org] there is a lot to go over here.  I'd love any small tasks 
you can assign to me to get my hands dirty working on the code.


> Add S3Guard committer for zero-rename commits to S3 endpoints
> -------------------------------------------------------------
>
>                 Key: HADOOP-13786
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13786
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs/s3
>    Affects Versions: HADOOP-13345
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>         Attachments: HADOOP-13786-HADOOP-13345-001.patch, 
> HADOOP-13786-HADOOP-13345-002.patch, HADOOP-13786-HADOOP-13345-003.patch, 
> HADOOP-13786-HADOOP-13345-004.patch, HADOOP-13786-HADOOP-13345-005.patch, 
> HADOOP-13786-HADOOP-13345-006.patch, HADOOP-13786-HADOOP-13345-006.patch, 
> HADOOP-13786-HADOOP-13345-007.patch, HADOOP-13786-HADOOP-13345-009.patch, 
> HADOOP-13786-HADOOP-13345-010.patch, HADOOP-13786-HADOOP-13345-011.patch, 
> HADOOP-13786-HADOOP-13345-012.patch, HADOOP-13786-HADOOP-13345-013.patch, 
> HADOOP-13786-HADOOP-13345-015.patch, HADOOP-13786-HADOOP-13345-016.patch, 
> HADOOP-13786-HADOOP-13345-017.patch, HADOOP-13786-HADOOP-13345-018.patch, 
> HADOOP-13786-HADOOP-13345-019.patch, HADOOP-13786-HADOOP-13345-020.patch, 
> HADOOP-13786-HADOOP-13345-021.patch, HADOOP-13786-HADOOP-13345-022.patch, 
> HADOOP-13786-HADOOP-13345-023.patch, HADOOP-13786-HADOOP-13345-024.patch, 
> HADOOP-13786-HADOOP-13345-025.patch, HADOOP-13786-HADOOP-13345-026.patch, 
> HADOOP-13786-HADOOP-13345-027.patch, HADOOP-13786-HADOOP-13345-028.patch, 
> HADOOP-13786-HADOOP-13345-028.patch, HADOOP-13786-HADOOP-13345-029.patch, 
> HADOOP-13786-HADOOP-13345-030.patch, objectstore.pdf, s3committer-master.zip
>
>
> 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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