[KAFKA-16565] IncrementalAssignmentConsumerEventHandler throws error when attempting to remove a partition that isn't assigned - ASF JIRA

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Details

Type: Bug
Status: Resolved
Priority: Critical
Resolution: Fixed
Affects Version/s: 3.8.0
Fix Version/s: 3.8.0
Component/s: clients, consumer, system tests
Labels:

Description

In verifiable_consumer.py, the IncrementalAssignmentConsumerEventHandler contains this logic:

def handle_partitions_revoked(self, event):
    self.revoked_count += 1
    self.state = ConsumerState.Rebalancing
    self.position = {}
    for topic_partition in event["partitions"]:
        topic = topic_partition["topic"]
        partition = topic_partition["partition"]
        self.assignment.remove(TopicPartition(topic, partition))

If the self.assignment.remove() call is passed a TopicPartition that isn't in the list, a generic Python list error is thrown. For now, we should first check that the TopicPartition is in the list with an assert that provides better information .