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https://issues.apache.org/jira/browse/HADOOP-15107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16313776#comment-16313776
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Steve Loughran commented on HADOOP-15107:
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Committers can reduce load on shards by shuffling their requests a bit
* Staging task commit: schedule the largest file first, then shuffle the rest.
Ensures that the biggest file isn't the straggler, and the rest go wherever.
* All job commit: shuffle the list of pending files
> 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
>
> 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.
> I'm now not sure that the magic committer works.
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