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https://issues.apache.org/jira/browse/HADOOP-15107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16398761#comment-16398761
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Steve Loughran commented on HADOOP-15107:
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Patch 002. No changes in functionality other than logging and some error
reporting. The things which turn out useful in troubleshooting. No other
changes to the code from patch 001
# {{StagingCommitter.failDestinationExists(path, operation)}} generates the
E_DEST_EXISTS exception when the destination dir exists. Before doing that, it
lists the first 10 descendants of the dest path. This helps you work out what's
going on when a conflict check fails (wrong output format used, something
created a file, etc, etc)
# better logging of the toString aspects of the committers, and
PathOutputCommitter's logging of lifecycle events.
> Prove the correctness of the new committers, or fix where they are not correct
> ------------------------------------------------------------------------------
>
> Key: HADOOP-15107
> URL: https://issues.apache.org/jira/browse/HADOOP-15107
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.1.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Attachments: HADOOP-15107-001.patch, HADOOP-15107-002.patch
>
>
> I'm writing about the paper on the committers, one which, being a proper
> paper, requires me to show the committers work.
> # define the requirements of a "Correct" committed job (this applies to the
> FileOutputCommitter too)
> # show that the Staging committer meets these requirements (most of this is
> implicit in that it uses the V1 FileOutputCommitter to marshall .pendingset
> lists from committed tasks to the final destination, where they are read and
> committed.
> # Show the magic committer also works.
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