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From "Matthias J. Sax (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6144) Allow state stores to serve stale reads during rebalance
Date Mon, 30 Oct 2017 23:53:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16226007#comment-16226007
] 

Matthias J. Sax commented on KAFKA-6144:
----------------------------------------

[~astubbs] Is this a duplicate of KAFKA-6031 ?

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



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