Jason Gustafson created KAFKA-4007:
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Summary: Improve fetch pipelining for low values of
max.poll.records
Key: KAFKA-4007
URL: https://issues.apache.org/jira/browse/KAFKA-4007
Project: Kafka
Issue Type: Improvement
Components: consumer
Reporter: Jason Gustafson
Currently the consumer will only send a prefetch for a partition after all the
records from the previous fetch have been consumed. This can lead to suboptimal
pipelining when max.poll.records is set very low since the processing latency
for a small set of records may be small compared to the latency of a fetch. An
improvement suggested by [~junrao] is to send the fetch anyway even if we have
unprocessed data buffered, but delay reading it from the socket until that data
has been consumed. Potentially the consumer can delay reading _any_ pending
fetch until it is ready to be returned to the user, which may help control
memory better.
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