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https://issues.apache.org/jira/browse/FLINK-2861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15018087#comment-15018087
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ASF GitHub Bot commented on FLINK-2861:
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Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1387#issuecomment-158416101
I ran into that issue a while back. The problem was that you emit elements
that have the name/tag of the split stream (to use the split selector) and over
that, you run the regular partitioner.
Splitting this into two steps should work: Splitting, having a mapper that
removes the "split tag" and then doing the field partitioning.
Would be nice to make this nice in Flink, but it is tricky. Not all
functions go though a collector, and not all collectors can split.
> Fields grouping on split streams fails
> --------------------------------------
>
> Key: FLINK-2861
> URL: https://issues.apache.org/jira/browse/FLINK-2861
> Project: Flink
> Issue Type: Bug
> Components: Storm Compatibility
> Affects Versions: 0.10.0
> Reporter: Stephan Ewen
> Assignee: Matthias J. Sax
>
> Using split streams works for shuffle grouping, but not for Fields grouping.
> The reason is that the KeySelector expects an array, and the given type is
> the {{SplitStreamType}}.
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