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https://issues.apache.org/jira/browse/KAFKA-6145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antony Stubbs updated KAFKA-6145:
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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
was:
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
> Warm up new KS instances before migrating tasks - potentially a two phase
> rebalance
> -----------------------------------------------------------------------------------
>
> Key: KAFKA-6145
> URL: https://issues.apache.org/jira/browse/KAFKA-6145
> 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 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
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