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Posted to dev@kafka.apache.org by "Antony Stubbs (JIRA)" <ji...@apache.org> on 2017/10/30 17:37:00 UTC

[jira] [Created] (KAFKA-6144) Allow state stores to serve stale reads during rebalance

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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