Guozhang Wang created KAFKA-2720:
------------------------------------
Summary: Periodic purging groups in the coordinator
Key: KAFKA-2720
URL: https://issues.apache.org/jira/browse/KAFKA-2720
Project: Kafka
Issue Type: Sub-task
Reporter: Guozhang Wang
Assignee: Guozhang Wang
Fix For: 0.9.1
Currently the coordinator removes the group (i.e. both removing it from the
cache and writing the tombstone message on its local replica without waiting
for ack) once it becomes an empty group.
This can lead to a few issues such as 1) group removal and creation churns when
a group with very few members are being rebalanced, 2) if the local write is
failed / not propagated to other followers, they can only be removed again when
a new coordinator is migrated and detects the group has no members already.
We could instead piggy-back the periodic offset expiration along with the group
purging as well which removes any groups that had no members already.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
