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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2861) Fields grouping on split streams fails
Date Fri, 20 Nov 2015 14:31:10 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15018087#comment-15018087
] 

ASF GitHub Bot commented on FLINK-2861:
---------------------------------------

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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