Description
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 would be two execute the rebalance in two phases:
1) start running state store building on the new node
2) once the state store is fully populated on the new node, only then rebalance the tasks - there will still be a rebalance pause, but would be greatly reduced
Relates to: KAFKA-6144 - Allow state stores to serve stale reads during rebalance
Attachments
Issue Links
- contains
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KAFKA-5578 Streams Task Assignor should consider the staleness of state directories when allocating tasks
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- Closed
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KAFKA-6039 Improve TaskAssignor to be more load balanced
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- Closed
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- is duplicated by
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KAFKA-8019 Better Scaling Experience for KStream
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- Resolved
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- relates to
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- Resolved
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- Resolved
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- links to
- mentioned in
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