[jira] [Created] (KAFKA-19405) Assignor stickiness should keep owned partitions instead of partitions waiting to be revoked by another member

["Sean Quah (Jira)" <ji...@apache.org>]

Sean Quah created KAFKA-19405:
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             Summary: Assignor stickiness should keep owned partitions instead of partitions waiting to be revoked by another member 
                 Key: KAFKA-19405
                 URL: https://issues.apache.org/jira/browse/KAFKA-19405
             Project: Kafka
          Issue Type: Improvement
          Components: group-coordinator
            Reporter: Sean Quah
            Assignee: Sean Quah


Imagine a new group with members joining. Each member is subscribed to the same topic.

 

1. The first member is assigned partitions \{1,2,3,4,5}

2. A second member joins and has a target assignment of \{3,4,5}.
3. The first member revokes partition 3.
4. The second member is assigned partition 3 in a heartbeat response.

5. A third member joins. The second member's target assignment is now \{5}.
6. The second member is assigned no partitions in a heartbeat response.

7. Later, the second member is assigned partition 5 in a heartbeat response, once it has been revoked by the first member.

 

From the perspective of the second member, it was assigned partition 3, then the assignment changed to partition 5.

From the perspective of the broker, the second member's target assignment was \{3,4,5}, then \{5}.

 

If assignor stickiness favored owned partitions, then the second member would see a more stable assignment and keep partition 3.



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