[jira] [Created] (KAFKA-10498) Consumer should do offset/epoch validation through `Fetch` when possible

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

Jason Gustafson created KAFKA-10498:
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             Summary: Consumer should do offset/epoch validation through `Fetch` when possible
                 Key: KAFKA-10498
                 URL: https://issues.apache.org/jira/browse/KAFKA-10498
             Project: Kafka
          Issue Type: Improvement
            Reporter: Jason Gustafson
            Assignee: Chia-Ping Tsai


Currently the consumer has logic to detect truncations (as a result of unclean leader election for example) using the OffsetsForLeaderEpoch API. It is a rather cumbersome and expensive process since we have to check for the need to send this request on every poll(). We should be able to do better now that KIP-595 has built support for truncation detection directly into the `Fetch` protocol. This should allow us to skip validation when we know that the `Fetch` version is high enough. 



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