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https://issues.apache.org/jira/browse/KAFKA-12639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-12639.
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Fix Version/s: 3.5.0
Resolution: Fixed
> AbstractCoordinator ignores backoff timeout when joining the consumer group
> ---------------------------------------------------------------------------
>
> Key: KAFKA-12639
> URL: https://issues.apache.org/jira/browse/KAFKA-12639
> Project: Kafka
> Issue Type: Bug
> Components: clients, consumer
> Affects Versions: 2.7.0
> Reporter: Matiss Gutmanis
> Assignee: Philip Nee
> Priority: Major
> Fix For: 3.5.0
>
>
> We observed heavy logging while trying to join consumer group during partial
> unavailability of Kafka cluster (it's part of our testing process). Seems
> that {{rebalanceConfig.retryBackoffMs}} used in {{
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator#joinGroupIfNeeded}}
> is not respected. Debugging revealed that {{Timer}} instance technically is
> expired thus using sleep of 0 milliseconds which defeats the purpose of
> backoff timeout.
> Minimal backoff timeout should be respected.
>
> {code:java}
> 2021-03-30 08:30:24,488 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] JoinGroup failed: Coordinator
> 127.0.0.1:9092 (id: 2147483634 rack: null) is loading the group.
> 2021-03-30 08:30:24,488 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] Rebalance failed.
> org.apache.kafka.common.errors.CoordinatorLoadInProgressException: The
> coordinator is loading and hence can't process requests.
> 2021-03-30 08:30:24,488 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] (Re-)joining group
> 2021-03-30 08:30:24,489 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] JoinGroup failed: Coordinator
> 127.0.0.1:9092 (id: 2147483634 rack: null) is loading the group.
> 2021-03-30 08:30:24,489 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] Rebalance failed.
> org.apache.kafka.common.errors.CoordinatorLoadInProgressException: The
> coordinator is loading and hence can't process requests.
> 2021-03-30 08:30:24,489 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] (Re-)joining group
> 2021-03-30 08:30:24,490 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] JoinGroup failed: Coordinator
> 127.0.0.1:9092 (id: 2147483634 rack: null) is loading the group.
> 2021-03-30 08:30:24,490 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] Rebalance failed.
> org.apache.kafka.common.errors.CoordinatorLoadInProgressException: The
> coordinator is loading and hence can't process requests.
> 2021-03-30 08:30:24,490 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] (Re-)joining group
> 2021-03-30 08:30:24,491 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] JoinGroup failed: Coordinator
> 127.0.0.1:9092 (id: 2147483634 rack: null) is loading the group.
> 2021-03-30 08:30:24,491 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] Rebalance failed.
> org.apache.kafka.common.errors.CoordinatorLoadInProgressException: The
> coordinator is loading and hence can't process requests.
> 2021-03-30 08:30:24,491 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] (Re-)joining group
> 2021-03-30 08:30:24,492 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] JoinGroup failed: Coordinator
> 127.0.0.1:9092 (id: 2147483634 rack: null) is loading the group.
> 2021-03-30 08:30:24,492 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] Rebalance failed.
> org.apache.kafka.common.errors.CoordinatorLoadInProgressException: The
> coordinator is loading and hence can't process requests.
> 2021-03-30 08:30:24,492 INFO
> [fs2-kafka-consumer-41][o.a.k.c.c.i.AbstractCoordinator] [Consumer
> clientId=app_clientid, groupId=consumer-group] (Re-)joining group
> {code}
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