[KAFKA-12390] error when storing group assignment during SyncGroup

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.4.0
• Component/s: offset manager
• Assignee: Unassigned
• Reporter: Andrey
• Created: 01/Mar/21 09:36
• Updated: 18/Mar/21 10:28

Description

There is a cluster consisting of 3 nodes
Apache Kafka Cluster 2.4.0
messages were observed in the logs of one of the nodes:
Preparing to rebalance group corecft-adapter2 in state PreparingRebalance with old generation 5043 (__consumer_offsets-22) (reason: error when storing group assignment during SyncGroup (member: consumer-5-5f3f994d-7c7c-43d6-8e0b-e011bdc2f9ba)) (kafka. coordinator.group.GroupCoordinator)

Messages from the topic were read, but no commit occurred. then there was balancing and the data in the topics was "doubled". There was also a "negative" lag

there are no error messages in the zookeeper logs