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https://issues.apache.org/jira/browse/KAFKA-48?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13256099#comment-13256099
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Jay Kreps commented on KAFKA-48:
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Joel, this is great feedback. I will address these issues in the commit since
most are naming/documentation related.
> 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: Jun Rao
> Assignee: Jay Kreps
> Attachments: KAFKA-48-v2.patch, KAFKA-48-v3.patch, KAFKA-48-v4.patch,
> KAFKA-48.patch, kafka-48-v3-to-v4-changes.diff
>
>
> 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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