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Instead of introducing methods getToBeRevokedPartitions and getLostPartitions, it is also possible to introduce a new poll method that returns all of the following: the new records, the partitions that will be revoked in the next call to poll, the partitions that were just lost. Because this is a separate poll method, it is possible to keep partition revoke behavior of the current poll method exactly the same (which is to complete partition revoke in the same poll). This prevents any backward compatibility problems at the cost of potential user confusion due there being 2 poll methods.

Rejected alternatives

None.