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https://issues.apache.org/jira/browse/KAFKA-1644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14151136#comment-14151136
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Jun Rao commented on KAFKA-1644:
--------------------------------
The reason that FetchResponse is special is that it uses the sendfile api to
transfer data from the filechannel to a remote socket, which avoids creating a
copy of the data in jvm heap.
> Inherit FetchResponse from RequestOrResponse
> --------------------------------------------
>
> Key: KAFKA-1644
> URL: https://issues.apache.org/jira/browse/KAFKA-1644
> Project: Kafka
> Issue Type: Bug
> Reporter: Anton Karamanov
> Assignee: Anton Karamanov
> Attachments:
> 0001-KAFKA-1644-Inherit-FetchResponse-from-RequestOrRespo.patch
>
>
> Unlike all other Kafka API responses {{FetchResponse}} is not a subclass of
> RequestOrResponse, which requires handling it as a special case while
> processing responses.
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