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https://issues.apache.org/jira/browse/KAFKA-21111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax reassigned KAFKA-21111:
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Assignee: Matthias J. Sax
> Ensure refiner backward compatibility
> -------------------------------------
>
> Key: KAFKA-21111
> URL: https://issues.apache.org/jira/browse/KAFKA-21111
> Project: Kafka
> Issue Type: Sub-task
> Components: group-coordinator, streams
> Reporter: Matthias J. Sax
> Assignee: Matthias J. Sax
> Priority: Critical
>
> We need to ensure that the refiner is only executed for new clients, RPC
> version 1+, but not for old RPC version 0 clients (4.2/4.3 release).
> Older clients don't report task-offsets, and thus we cannot use warmup tasks
> because w/o the ability to observe their restore progress, we could never
> promote them as active later.
> Note one corner case: after a GC fail-over, a member might not have send a
> heartbeat yet, and thus we don't know it's RPC version yet. Atm, the code
> treats this incorrectly, and would optimistically assume that it's a v1
> client and that the refiner can run. This must be change to being
> conservative and treating "unknown" as don't run the refiner.
> The high level id
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