[jira] [Created] (KAFKA-7961) Handle subscription changes with a rebalance in progress

["Jason Gustafson (JIRA)" <ji...@apache.org>]

Jason Gustafson created KAFKA-7961:
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             Summary: Handle subscription changes with a rebalance in progress
                 Key: KAFKA-7961
                 URL: https://issues.apache.org/jira/browse/KAFKA-7961
             Project: Kafka
          Issue Type: Bug
            Reporter: Jason Gustafson
            Assignee: Jason Gustafson


Due to wakeups or poll timeouts, it is possible to have a subscription changed while a rebalance is in progress. This can lead to an illegal state error such as the following if some of the assigned partitions no longer match the subscription:

{code}
java.lang.IllegalArgumentException: Assigned partition foo-0 for non-subscribed topic; subscription is [bar]
	at org.apache.kafka.clients.consumer.internals.SubscriptionState.assignFromSubscribed(SubscriptionState.java:192)
	at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:249)
	at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:410)
	at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:344)
	at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:344)
	at org.apache.kafka.clients.consumer.KafkaConsumer.updateAssignmentMetadataIfNeeded(KafkaConsumer.java:1226)
	at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1191)
	at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1176)
{code}

Rather than requiring the assignment received from a rebalance to match the subscription, we should just request a rebalance.



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