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https://issues.apache.org/jira/browse/FLINK-2897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15044836#comment-15044836
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Robert Metzger commented on FLINK-2897:
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I think there was one open remark with your pull request, that's probably why
it wasn't merged yet.
> Use distinct initial indices for OutputEmitter round-robin
> ----------------------------------------------------------
>
> Key: FLINK-2897
> URL: https://issues.apache.org/jira/browse/FLINK-2897
> Project: Flink
> Issue Type: Improvement
> Components: Distributed Runtime
> Affects Versions: 0.10.0
> Reporter: Greg Hogan
> Assignee: Greg Hogan
>
> Currently, when performing a round-robin partitioning each task will
> sequentially partition starting with partition "1". This is fine in the usual
> case where the number of partitioned objects greatly exceeds the number of
> channels. However, in the case where the number of objects is relatively few
> (each, perhaps, requiring a large computation or access to an external
> system) it would be much better to begin partitioning at distinct indices
> (the task index).
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