[jira] [Created] (KAFKA-10315) Consider to throw exception for failed fetch requests

["Matthias J. Sax (Jira)" <ji...@apache.org>]

Matthias J. Sax created KAFKA-10315:
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             Summary: Consider to throw exception for failed fetch requests
                 Key: KAFKA-10315
                 URL: https://issues.apache.org/jira/browse/KAFKA-10315
             Project: Kafka
          Issue Type: Improvement
          Components: clients
            Reporter: Matthias J. Sax


The current `Consumer#poll(Duration)` method is designed to block until data is available or the provided poll timeout expires. This implies, that if fetch requests fail the consumer retries them internally and eventually returns an empty set of records. – Thus, from a user point of view, returning an empty set of records can mean that no data is available broker side or that the broker cannot be reached.

For Kafka Streams, this behavior is problematic as its runtime would like to distinguish both cases, to apply its own timeouts (cf https://issues.apache.org/jira/browse/KAFKA-9274).

One idea to address this issue is to add a new method `Consumer#pollOnce()` that would throw an exception if a fetch request fails instead of retrying internally.



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