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https://issues.apache.org/jira/browse/KAFKA-12640?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-12640.
-------------------------------------
    Resolution: Duplicate

> AbstractCoordinator ignores backoff timeout when joining the consumer group
> ---------------------------------------------------------------------------
>
>                 Key: KAFKA-12640
>                 URL: https://issues.apache.org/jira/browse/KAFKA-12640
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer
>    Affects Versions: 2.7.0
>            Reporter: Matiss Gutmanis
>            Priority: Major
>
> 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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