[jira] [Created] (KAFKA-6352) Delay message down-conversion until response is ready to be sent

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

Jason Gustafson created KAFKA-6352:
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             Summary: Delay message down-conversion until response is ready to be sent
                 Key: KAFKA-6352
                 URL: https://issues.apache.org/jira/browse/KAFKA-6352
             Project: Kafka
          Issue Type: Improvement
            Reporter: Jason Gustafson


We have observed some users beginning to use the new message format before their clients have been upgraded. As we know, this can cause a lot of memory pressure due to the fact that we lose zero-copy in order to down-convert the messages. Currently we do down-conversion prior to enqueuing the response to be sent by the Processor. This may lead to more heap utilization than needed with a steady queue size. 

A possible improvement is to delay the down-conversion until the response is actually ready to be sent. Even better would be to do the down-conversion in a streaming fashion, converting only as much as is needed at any time. One potential drawback is that this moves the down-conversion into the network threads.



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