[jira] [Updated] (FLINK-6552) Ambiguous error message when retrieving multiple side-outputs

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-6552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek updated FLINK-6552:
------------------------------------
    Component/s:     (was: Streaming)
                 DataStream API

> Ambiguous error message when retrieving multiple side-outputs
> -------------------------------------------------------------
>
>                 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
>
> 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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