Matthias J. Sax created KAFKA-21111:
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Summary: 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
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.
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