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Posted to dev@kafka.apache.org by "A. Sophie Blee-Goldman (Jira)" <ji...@apache.org> on 2021/03/16 02:28:00 UTC

[jira] [Created] (KAFKA-12473) Make the CooperativeStickyAssignor the default assignor

A. Sophie Blee-Goldman created KAFKA-12473:
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             Summary: 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
             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 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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