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https://issues.apache.org/jira/browse/FLINK-5985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15924352#comment-15924352
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ASF GitHub Bot commented on FLINK-5985:
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Github user gyfora commented on the issue:
https://github.com/apache/flink/pull/3523
There seems to have been some changes in the StreamTask and some tests so I
couldn't rebase this nicely. Do you have a minute to take a look and maybe push
a branch with the backport please? That would help me a lot.
> 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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