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https://issues.apache.org/jira/browse/KAFKA-12473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17302193#comment-17302193
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Luke Chen commented on KAFKA-12473:
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Got it! Thank you.
> Make the CooperativeStickyAssignor the default assignor
> -------------------------------------------------------
>
> Key: KAFKA-12473
> URL: https://issues.apache.org/jira/browse/KAFKA-12473
> Project: Kafka
> Issue Type: Improvement
> Components: consumer
> Reporter: A. Sophie Blee-Goldman
> Assignee: Luke Chen
> Priority: Critical
> Labels: needs-kip
> Fix For: 3.0.0
>
>
> Now that 3.0 is coming up, we can change the default
> ConsumerPartitionAssignor to something better than the RangeAssignor. The
> original plan was to switch over to the StickyAssignor, but now that we have
> incremental cooperative rebalancing we should consider using the new
> CooperativeStickyAssignor instead: this will enable the consumer group to
> follow the COOPERATIVE protocol, improving the rebalancing experience OOTB.
> Note that this will require users to follow the [upgrade path laid out in
> KIP-429|https://cwiki.apache.org/confluence/display/KAFKA/KIP-429:+Kafka+Consumer+Incremental+Rebalance+Protocol#KIP429:KafkaConsumerIncrementalRebalanceProtocol-Consumer]
> to safely perform a rolling upgrade. When we change the default assignor we
> need to make sure this is clearly documented in the upgrade guide for 3.0
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