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https://issues.apache.org/jira/browse/FLINK-5985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15901424#comment-15901424
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Gyula Fora commented on FLINK-5985:
-----------------------------------

I was somehow assuming that this affects all jobs. Unfortunately I cannot send 
the program but I can try to reproduce it in a minimal example tomorrow. I know 
this used to work in 1.1 with pretty much the same job.

> 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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