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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6552) Side outputs don't allow differing output types
Date Tue, 16 May 2017 11:55:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012208#comment-16012208
] 

ASF GitHub Bot commented on FLINK-6552:
---------------------------------------

Github user aljoscha commented on the issue:

    https://github.com/apache/flink/pull/3885
  
    Thanks @tedyu and @zentol! I pushed another commit with these minor fixes.


> Side outputs don't allow differing output types
> -----------------------------------------------
>
>                 Key: FLINK-6552
>                 URL: https://issues.apache.org/jira/browse/FLINK-6552
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API
>    Affects Versions: 1.3.0, 1.4.0
>            Reporter: Chesnay Schepler
>            Assignee: Aljoscha Krettek
>            Priority: Blocker
>             Fix For: 1.3.0
>
>
> When calling {SingleOutputStreamOperator#getSideOutput(OutputTag<X>} multiple times
with the output tags having different types you get the following exception:
> {code}
>  "Trying to add a side input for the same id with a different type. This is not allowed."

> {code}
> This error message is ambiguous, as it could either mean that you cannot add 2 side outputs
with the same name but different types or that 2 side outputs with different types cannot
be retrieved from a single operator.
> Furthermore, the error message contains the concept of node id's (i guess?) which users
aren't exposed to. This is confusing and should be reworded to work with operators.
> Lastly, i find this limitation rather odd. It is possible for an operator to have multiple
side outputs. It is also possible to have a side output with a different type than the main
output. Yet, it is not possible to have multiple side outputs with different types.



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