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https://issues.apache.org/jira/browse/FLINK-5985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15900973#comment-15900973
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Ufuk Celebi commented on FLINK-5985:
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It should be possible to change the topology if you set the UIDs *only* for the
stateful operators, because these are the only ones that are part of the
savepoint state.
If you don't set any UIDs, changing the topology will result in a changed auto
generated UID for the stateful operators as well. That's the situation you are
describing here, right?
> 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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