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https://issues.apache.org/jira/browse/KAFKA-48?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148835#comment-13148835
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Jun Rao commented on KAFKA-48:
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Just had a chance to look at the patch. Agree in principle this would work.
It's probably better to create a separate jira for moving the requesthandler
out of socket server. The long poll jira will depend on that jira.
> Implement optional "long poll" support in fetch request
> -------------------------------------------------------
>
> Key: KAFKA-48
> URL: https://issues.apache.org/jira/browse/KAFKA-48
> Project: Kafka
> Issue Type: Bug
> Reporter: Alan Cabrera
> Assignee: Jay Kreps
> Attachments: KAFKA-48-socket-server-refactor-draft.patch
>
>
> Currently, the fetch request is non-blocking. If there is nothing on the
> broker for the consumer to retrieve, the broker simply returns an empty set
> to the consumer. This can be inefficient, if you want to ensure low-latency
> because you keep polling over and over. We should make a blocking version of
> the fetch request so that the fetch request is not returned until the broker
> has at least one message for the fetcher or some timeout passes.
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