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https://issues.apache.org/jira/browse/FLINK-19083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dawid Wysakowicz closed FLINK-19083.
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    Release Note: The DataStream#split() operation has been removed after being 
marked as deprecated for a couple of versions. Please use Side Outputs instead: 
https://ci.apache.org/projects/flink/flink-docs-stable/dev/stream/side_output.html
      Resolution: Fixed

Removed in 1a08548a209167cafeeba1ce602fe8d542994be5

> Remove deprecated DataStream#split
> ----------------------------------
>
>                 Key: FLINK-19083
>                 URL: https://issues.apache.org/jira/browse/FLINK-19083
>             Project: Flink
>          Issue Type: Sub-task
>          Components: API / DataStream
>            Reporter: Dawid Wysakowicz
>            Assignee: Dawid Wysakowicz
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.12.0
>
>
> {{DataStream#split()}} has been deprecated in favour of using Side Outputs 
> because: 
>  - It is less performant, {{split()}} creates and checks against {{Strings}} 
> for the splitting logic.
>  - {{split()}} was and is buggy : see FLINK-5031 and FLINK-11084, for example
>  - The semantics of consecutive splits are not very clear in general.
>  - Side outputs are more general and everything that could be done using 
> {{split()}} can be achieved with side outputs with strictly better 
> performance.



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