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https://issues.apache.org/jira/browse/FLINK-5985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15931916#comment-15931916
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Aljoscha Krettek commented on FLINK-5985:
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[~srichter] Did you also put this onto the release-1.2 branch? I'm asking since
it's marked as "fixed for 1.2.1".
> 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
> Assignee: Stefan Richter
> Priority: Critical
> Fix For: 1.3.0, 1.2.1
>
>
> 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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