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

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

     [ https://issues.apache.org/jira/browse/KAFKA-6352?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jason Gustafson reassigned KAFKA-6352:
--------------------------------------

    Assignee: Jason Gustafson

> 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
>            Assignee: 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 down-convert the full response in memory. Currently we do this down-conversion prior to enqueuing the response to be sent by the Processor, which may cause 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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