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Posted to jira@kafka.apache.org by "David Jacot (Jira)" <ji...@apache.org> on 2023/04/28 09:18:00 UTC
[jira] [Resolved] (KAFKA-14639) Kafka CooperativeStickyAssignor revokes/assigns partition in one rebalance cycle
[ https://issues.apache.org/jira/browse/KAFKA-14639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David Jacot resolved KAFKA-14639.
---------------------------------
Fix Version/s: 3.5.0
Reviewer: David Jacot
Resolution: Fixed
> Kafka CooperativeStickyAssignor revokes/assigns partition in one rebalance cycle
> --------------------------------------------------------------------------------
>
> Key: KAFKA-14639
> URL: https://issues.apache.org/jira/browse/KAFKA-14639
> Project: Kafka
> Issue Type: Bug
> Components: clients, consumer
> Affects Versions: 3.2.1
> Reporter: Bojan Blagojevic
> Assignee: Philip Nee
> Priority: Major
> Fix For: 3.5.0
>
> Attachments: consumers-jira.log
>
>
> I have an application that runs 6 consumers in parallel. I am getting some unexpected results when I use {{{}CooperativeStickyAssignor{}}}. If I understand the mechanism correctly, if the consumer looses partition in one rebalance cycle, the partition should be assigned in the next rebalance cycle.
> This assumption is based on the [RebalanceProtocol|https://kafka.apache.org/31/javadoc/org/apache/kafka/clients/consumer/ConsumerPartitionAssignor.RebalanceProtocol.html] documentation and few blog posts that describe the protocol, like [this one|https://www.confluent.io/blog/cooperative-rebalancing-in-kafka-streams-consumer-ksqldb/] on Confluent blog.
> {quote}The assignor should not reassign any owned partitions immediately, but instead may indicate consumers the need for partition revocation so that the revoked partitions can be reassigned to other consumers in the next rebalance event. This is designed for sticky assignment logic which attempts to minimize partition reassignment with cooperative adjustments.
> {quote}
> {quote}Any member that revoked partitions then rejoins the group, triggering a second rebalance so that its revoked partitions can be assigned. Until then, these partitions are unowned and unassigned.
> {quote}
> These are the logs from the application that uses {{{}protocol='cooperative-sticky'{}}}. In the same rebalance cycle ({{{}generationId=640{}}}) {{partition 74}} moves from {{consumer-3}} to {{{}consumer-4{}}}. I omitted the lines that are logged by the other 4 consumers.
> Mind that the log is in reverse(bottom to top)
> {code:java}
> 2022-12-14 11:18:24 1 — [consumer-3] x.y.z.MyRebalanceHandler1 : New partition assignment: partition-59, seek to min common offset: 85120524
> 2022-12-14 11:18:24 1 — [consumer-3] x.y.z.MyRebalanceHandler2 : Partitions [partition-59] assigned successfully
> 2022-12-14 11:18:24 1 — [consumer-3] x.y.z.MyRebalanceHandler1 : Partitions assigned: [partition-59]
> 2022-12-14 11:18:24 1 — [consumer-3] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-3-my-client-id-my-group-id, groupId=my-group-id] Adding newly assigned partitions: partition-59
> 2022-12-14 11:18:24 1 — [consumer-3] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-3-my-client-id-my-group-id, groupId=my-group-id] Notifying assignor about the new Assignment(partitions=[partition-59])
> 2022-12-14 11:18:24 1 — [consumer-3] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-3-my-client-id-my-group-id, groupId=my-group-id] Request joining group due to: need to revoke partitions [partition-26, partition-74] as indicated by the current assignment and re-join
> 2022-12-14 11:18:24 1 — [consumer-3] x.y.z.MyRebalanceHandler2 : Partitions [partition-26, partition-74] revoked successfully
> 2022-12-14 11:18:24 1 — [consumer-3] x.y.z.MyRebalanceHandler1 : Finished removing partition data
> 2022-12-14 11:18:24 1 — [consumer-4] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-4-my-client-id-my-group-id, groupId=my-group-id] (Re-)joining group
> 2022-12-14 11:18:24 1 — [consumer-4] x.y.z.MyRebalanceHandler1 : New partition assignment: partition-74, seek to min common offset: 107317730
> 2022-12-14 11:18:24 1 — [consumer-4] x.y.z.MyRebalanceHandler2 : Partitions [partition-74] assigned successfully
> 2022-12-14 11:18:24 1 — [consumer-4] x.y.z.MyRebalanceHandler1 : Partitions assigned: [partition-74]
> 2022-12-14 11:18:24 1 — [consumer-4] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-4-my-client-id-my-group-id, groupId=my-group-id] Adding newly assigned partitions: partition-74
> 2022-12-14 11:18:24 1 — [consumer-4] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-4-my-client-id-my-group-id, groupId=my-group-id] Notifying assignor about the new Assignment(partitions=[partition-74])
> 2022-12-14 11:18:24 1 — [consumer-4] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-4-my-client-id-my-group-id, groupId=my-group-id] Request joining group due to: need to revoke partitions [partition-57] as indicated by the current assignment and re-join
> 2022-12-14 11:18:24 1 — [consumer-4] x.y.z.MyRebalanceHandler2 : Partitions [partition-57] revoked successfully
> 2022-12-14 11:18:24 1 — [consumer-4] x.y.z.MyRebalanceHandler1 : Finished removing partition data
> 2022-12-14 11:18:22 1 — [consumer-3] x.y.z.MyRebalanceHandler1 : Partitions revoked: [partition-26, partition-74]
> 2022-12-14 11:18:22 1 — [consumer-3] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-3-my-client-id-my-group-id, groupId=my-group-id] Revoke previously assigned partitions partition-26, partition-74
> 2022-12-14 11:18:22 1 — [consumer-3] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-3-my-client-id-my-group-id, groupId=my-group-id] Updating assignment with\n\tAssigned partitions: [partition-59]\n\tCurrent owned partitions: [partition-26, partition-74]\n\tAdded partitions (assigned - owned): [partition-59]\n\tRevoked partitions (owned - assigned): [partition-26, partition-74]
> 2022-12-14 11:18:22 1 — [consumer-3] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-3-my-client-id-my-group-id, groupId=my-group-id] Successfully synced group in generation Generation{generationId=640, memberId='partition-3-my-client-id-my-group-id-c31afd19-3f22-43cb-ad07-9088aa98d3af', protocol='cooperative-sticky'}
> 2022-12-14 11:18:22 1 — [consumer-3] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-3-my-client-id-my-group-id, groupId=my-group-id] Successfully joined group with generation Generation{generationId=640, memberId='partition-3-my-client-id-my-group-id-c31afd19-3f22-43cb-ad07-9088aa98d3af', protocol='cooperative-sticky'}
> 2022-12-14 11:18:22 1 — [consumer-4] x.y.z.MyRebalanceHandler1 : Partitions revoked: [partition-57]
> 2022-12-14 11:18:22 1 — [consumer-4] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-4-my-client-id-my-group-id, groupId=my-group-id] Revoke previously assigned partitions partition-57
> 2022-12-14 11:18:22 1 — [consumer-4] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-4-my-client-id-my-group-id, groupId=my-group-id] Updating assignment with\n\tAssigned partitions: [partition-74]\n\tCurrent owned partitions: [partition-57]\n\tAdded partitions (assigned - owned): [partition-74]\n\tRevoked partitions (owned - assigned): [partition-57]
> 2022-12-14 11:18:21 1 — [id-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-4-my-client-id-my-group-id, groupId=my-group-id] Successfully synced group in generation Generation{generationId=640, memberId='partition-4-my-client-id-my-group-id-ae2af665-edc9-4a8e-b658-98372d142477', protocol='cooperative-sticky'}
> 2022-12-14 11:18:21 1 — [consumer-4] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=partition-4-my-client-id-my-group-id, groupId=my-group-id] Successfully joined group with generation Generation{generationId=640, memberId='partition-4-my-client-id-my-group-id-ae2af665-edc9-4a8e-b658-98372d142477', protocol='cooperative-sticky'} {code}
> Is this expected?
> Kafka client version is 3.2.1.
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