[jira] [Created] (KAFKA-2493) Add ability to fetch only keys in consumer

["Ivan Balashov (JIRA)" <ji...@apache.org>]

Ivan Balashov created KAFKA-2493:
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             Summary: Add ability to fetch only keys in consumer
                 Key: KAFKA-2493
                 URL: https://issues.apache.org/jira/browse/KAFKA-2493
             Project: Kafka
          Issue Type: Wish
          Components: consumer
            Reporter: Ivan Balashov
            Assignee: Neha Narkhede
            Priority: Minor


Often clients need to find out which offsets contain necessary data. One of the possible solutions would be to iterate with small fetch size. However, this still leads to unnecessary data being transmitted in case keys already reference searched data. The ability to fetch keys only would simplify search for the necessary offset.

Of course, there can be other scenarios where consumer needs keys only, without message part.



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