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https://issues.apache.org/jira/browse/BEAM-7038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16813533#comment-16813533
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Kenneth Knowles commented on BEAM-7038:
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It appears that Combine with hotkey fanout uses a Java serialized "custom"
coder for InputOrAccum.
Java serialized custom Coders are not supported for Dataflow update. We
urgently need to make this coder a StructuredCoder so it is safe for update.
That fix will necessarily be update incompatible.
> coder changes are incompatible with dataflow update operation
> -------------------------------------------------------------
>
> Key: BEAM-7038
> URL: https://issues.apache.org/jira/browse/BEAM-7038
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Affects Versions: 2.12.0
> Reporter: Boyuan Zhang
> Assignee: Kenneth Knowles
> Priority: Blocker
> Fix For: 2.12.0
>
>
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