Sean Quah created KAFKA-18688:
---------------------------------
Summary: Uniform homogeneous assignment is not always stable
Key: KAFKA-18688
URL: https://issues.apache.org/jira/browse/KAFKA-18688
Project: Kafka
Issue Type: Bug
Components: group-coordinator
Reporter: Sean Quah
The uniform homogeneous assignor assigns partitions to group members which have
identical subscriptions. When the number of partitions is not divisible by the
number of members, some members will end up with 1 more partition than others.
The assignor iterates over members and chooses the first {{partitions %
members}} members to have the extra partition. Even when the existing
assignment is balanced, the assignor can decide that a different set of members
should have the extra partition, due to the iteration order.
This means that when a static member is replaced and the assignment is
recomputed, it may gain or lose a single partition.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
