Lianet Magrans created KAFKA-15539:
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             Summary: Stop fetching while partitions being revoked
                 Key: KAFKA-15539
                 URL: https://issues.apache.org/jira/browse/KAFKA-15539
             Project: Kafka
          Issue Type: Task
          Components: clients, consumer
            Reporter: Lianet Magrans


When partitions are being revoked (client received revocation on heartbeat and 
is in the process of invoking the callback), we need to make sure we do not 
fetch from those partitions anymore:
 * no new fetches should be sent out for the partitions being revoked
 * no fetch responses should be handled for those partitions (case where a 
fetch was already in-flight when the partition revocation started.

This does not seem to be handled in the current KafkaConsumer and the old 
consumer protocol (only for the EAGER protocol). 

Consider re-using the existing pendingRevocation logic that already exist in 
the subscriptionState & used from the fetcher to determine if a partition is 
fetchable. 



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