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https://issues.apache.org/jira/browse/FLINK-5985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15926172#comment-15926172
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ASF GitHub Bot commented on FLINK-5985:
---------------------------------------

Github user StephanEwen commented on the issue:

    https://github.com/apache/flink/pull/3543
  
    Good fix!
    
    I think that verifying the possibility to reconfigure a job with respect to 
stateless operators warrants an ITCase. Can we extend the `SavepointITCase` for 
that?


> Flink treats every task as stateful (making topology changes impossible)
> ------------------------------------------------------------------------
>
>                 Key: FLINK-5985
>                 URL: https://issues.apache.org/jira/browse/FLINK-5985
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.2.0
>            Reporter: Gyula Fora
>            Priority: Critical
>
> It seems  that Flink treats every Task as stateful so changing the topology 
> is not possible without setting uid on every single operator.
> If the topology has an iteration this is virtually impossible (or at least 
> gets super hacky)



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