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https://issues.apache.org/jira/browse/FLINK-5985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15903110#comment-15903110
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Gyula Fora commented on FLINK-5985:
-----------------------------------
You can easily reproduce the bug locally by running the following simple
program:
https://gist.github.com/gyfora/b5ccf836dc9e95bab2b1f5f483cb8bf6
Take a savepoint and uncomment the stateless map before the sink to change the
sink hash then restore.
> 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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