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From "Ismael Juma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-4631) Refresh consumer metadata more frequently for unknown subscribed topics
Date Wed, 25 Jan 2017 15:58:26 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-4631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15837964#comment-15837964

Ismael Juma commented on KAFKA-4631:

Are we still aiming to have this done by this Friday (code freeze)? Or should we update the
fix version?

> Refresh consumer metadata more frequently for unknown subscribed topics
> -----------------------------------------------------------------------
>                 Key: KAFKA-4631
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4631
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Jason Gustafson
>            Assignee: Matthias J. Sax
>            Priority: Minor
>             Fix For:
> By default, the consumer refreshes metadata every 5 minutes. In testing, it can often
happen that a topic is created at about the same time that the consumer is started. In the
worst case, creation finishes after the consumer fetches metadata, and the test must wait
5 minutes for the consumer to refresh metadata in order to discover the topic. To address
this problem, users can decrease the metadata refresh interval, but this means more frequent
refreshes even after all topics are known. An improvement would be to internally let the consumer
fetch metadata more frequently when the consumer encounters unknown topics. Perhaps every
5-10 seconds would be reasonable, for example.

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