[jira] [Commented] (KAFKA-48) Implement optional "long poll" support in fetch request

["Taylor Gautier (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-48?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13200138#comment-13200138 ] 

Taylor Gautier commented on KAFKA-48:
-------------------------------------

Jay - that's great to hear!! Would you mind summarizing the way that the long-poll works?  I know that several different implementations were suggested here on the thread and I wanted to know which one you ultimately decided to go with.
                
> 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.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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