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From "Thomas Demoor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13786) add output committer which uses s3guard for consistent commits to S3
Date Fri, 16 Dec 2016 18:03:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15755099#comment-15755099
] 

Thomas Demoor commented on HADOOP-13786:
----------------------------------------

Had my write-up ready but you beat me too actually submitting [~stevel@apache.org]

Filed HADOOP-13912 so we can track this separately, but I think it should go on top on what
you have already done in the current ticket.



> add output committer which uses s3guard for consistent 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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