Antony Stubbs created KAFKA-6144:
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Summary: Allow state stores to serve stale reads during rebalance
Key: KAFKA-6144
URL: https://issues.apache.org/jira/browse/KAFKA-6144
Project: Kafka
Issue Type: New Feature
Components: streams
Reporter: Antony Stubbs
Currently when expanding the KS cluster, the new node's partitions will be
unavailable during the rebalance, which for large states can take a very long
time, or for small state stores even more than a few ms can be a deal breaker
for micro service use cases.
One workaround is to allow stale data to be read from the state stores when use
case allows.
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