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From "Ryan Blue (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15003) Merge S3A committers into trunk: Yetus patch checker
Date Wed, 08 Nov 2017 16:11:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16244232#comment-16244232
] 

Ryan Blue commented on HADOOP-15003:
------------------------------------

I don't think the partitioned committer should continue the _SUCCESS marker convention. Nothing
that writes partitioned data currently depends on _SUCCESS markers, so it's easy to avoid
the problem entirely because the markers are unreliable: what happens when you're appending
data to a partition?

We implemented a property that allows users to opt in to have _SUCCESS created for the directory
output committer only. It creates the _SUCCESS marker after all other operations have finished
because that's when we can guarantee that the write was successful. It doesn't delete other
markers because there are no well-defined semantics for _SUCCESS with overwrite.

> Merge S3A committers into trunk: Yetus patch checker
> ----------------------------------------------------
>
>                 Key: HADOOP-15003
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15003
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.0.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>         Attachments: HADOOP-13786-041.patch, HADOOP-13786-042.patch, HADOOP-13786-043.patch,
HADOOP-13786-044.patch, HADOOP-13786-045.patch, HADOOP-13786-046.patch
>
>
> This is a Yetus only JIRA created to have Yetus review the HADOOP-13786/HADOOP-14971
patch as a .patch file, as the review PR [https://github.com/apache/hadoop/pull/282] is stopping
this happening in HADOOP-14971.
> Reviews should go into the PR/other task



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