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

["Jay Kreps (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-48?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jay Kreps updated KAFKA-48:
---------------------------

    Attachment: KAFKA-48-v2.patch

This version of the patch updates the code to work with the new request objects and correctly respect the min_bytes and max_fetch_wait settings.

Please review the new configs and make sure we are happy with the naming.
                
> 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.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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