[jira] [Updated] (KAFKA-6145) Warm up new KS instances before migrating tasks - potentially a two phase rebalance

["Matthias J. Sax (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-6145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias J. Sax updated KAFKA-6145:
-----------------------------------
    Labels: needs-kip  (was: )

> 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
>            Priority: Major
>              Labels: needs-kip
>
> 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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