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https://issues.apache.org/jira/browse/KAFKA-12890?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot updated KAFKA-12890:
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Fix Version/s: 3.0.0
> Consumer group stuck in `CompletingRebalance`
> ---------------------------------------------
>
> Key: KAFKA-12890
> URL: https://issues.apache.org/jira/browse/KAFKA-12890
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 2.7.0, 2.6.1, 2.8.0, 2.7.1, 2.6.2
> Reporter: David Jacot
> Assignee: David Jacot
> Priority: Blocker
> Fix For: 3.0.0
>
>
> We have seen recently multiple consumer groups stuck in
> `CompletingRebalance`. It appears that those group never receives the
> assignment from the leader of the group and remains stuck in this state
> forever.
> When a group transitions to the `CompletingRebalance` state, the group
> coordinator sets up `DelayedHeartbeat` for each member of the group. It does
> so to ensure that the member sends a sync request within the session timeout.
> If it does not, the group coordinator rebalances the group. Note that here,
> `DelayedHeartbeat` is used here for this purpose. `DelayedHeartbeat` are also
> completed when member heartbeats.
> The issue is that https://github.com/apache/kafka/pull/8834 has changed the
> heartbeat logic to allow members to heartbeat while the group is in the
> `CompletingRebalance` state. This was not allowed before. Now, if a member
> starts to heartbeat while the group is in the `CompletingRebalance`, the
> heartbeat request will basically complete the pending `DelayedHeartbeat` that
> was setup previously for catching not receiving the sync request. Therefore,
> if the sync request never comes, the group coordinator does not notice
> anymore.
> We need to bring that behavior back somehow.
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