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Posted to jira@kafka.apache.org by "Antony Stubbs (JIRA)" <ji...@apache.org> on 2017/11/01 17:18:00 UTC

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

    [ https://issues.apache.org/jira/browse/KAFKA-6144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16234406#comment-16234406 ] 

Antony Stubbs commented on KAFKA-6144:
--------------------------------------

Yes @mjsax I believe it is, sorry I had a look but didn't find it before. Good to have both the wordings though :)

> 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
>            Priority: Major
>
> 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.
> Relates to KAFKA-6145 - Warm up new KS instances before migrating tasks - potentially a two phase rebalance



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