Matiss Gutmanis created KAFKA-12639:
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Summary: 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: consumer
Affects Versions: 2.7.0
Reporter: Matiss Gutmanis
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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