[jira] [Created] (KAFKA-20115) Group coordinator fails to unload metadata when no longer leader or follower

["Sean Quah (Jira)" <ji...@apache.org>]

Sean Quah created KAFKA-20115:
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             Summary: Group coordinator fails to unload metadata when no longer leader or follower
                 Key: KAFKA-20115
                 URL: https://issues.apache.org/jira/browse/KAFKA-20115
             Project: Kafka
          Issue Type: Bug
          Components: group-coordinator
    Affects Versions: 4.1.1, 4.1.0, 4.0.1, 4.2.0
            Reporter: Sean Quah


KAFKA-19427 introduced logic in the coordinator runtime's {{freeCurrentBatch}} to only recycle batch buffers when their size is less than or equal to the partition's max message size.
 
KAFKA-19519 replaced the max message size with the group.coordinator.cached.buffer.max.bytes and share.coordinator.cached.buffer.max.bytes configs.

{{PartitionWriter.config()}} throws a {{NOT_LEADER_OR_FOLLOWER}} exception when the broker is no longer a leader or follower of the partition.

When unloading partitions from the group coordinator, we try to free the current batch. If the broker is no longer a leader or follower of the {{__consumer_offsets}} partition, a {{NOT_LEADER_OR_FOLLOWER}} exception is thrown and we do not complete the unload process. This leaves classic group rebalance requests like JOIN_GROUP and SYNC_GROUP hanging.



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