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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