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https://issues.apache.org/jira/browse/FLINK-5985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15901105#comment-15901105
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Gyula Fora commented on FLINK-5985:
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Hi Ufuk,
I did exactly this yesterday:
First got an error like: Cannot map savepoint state for operator xxx to the new
program, because the operator is not available in the new program. Then I added
the debugging to see which actual operator was misbehaving.
It showed a stateless map, so I was like whatever and set the uidHash(xxx) and
I tried again. Now it gave the same error for a different stateless operator
(lets say a filter). I kept adding the hashes for the stateless operators until
I reached to the point where it complained about not being able to map back the
Iteration sink, that's when I gave up.
> 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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