[jira] [Commented] (KAFKA-4533) subscribe() then poll() on new topic is very slow when subscribed to many topics

["Ismael Juma (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-4533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15767243#comment-15767243 ] 

Ismael Juma commented on KAFKA-4533:
------------------------------------

Thanks for the report. The requests are done in batches. We'd need more information to understand the issue. Maybe you can attach more of the log?

> subscribe() then poll() on new topic is very slow when subscribed to many topics
> --------------------------------------------------------------------------------
>
>                 Key: KAFKA-4533
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4533
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients
>    Affects Versions: 0.10.1.0
>            Reporter: Sergey Alaev
>
> Given following case:
> consumer.subscribe(my_new_topic, [249 existing topics])
> publisher.send(my_new_topic, key, value)
> poll(10) until data from my_new_topic arrives
> I see data from `my_new_topic` only after approx. 90 seconds.
> If I subscribe only to my_new_topic, I get results within seconds.
> Logs contain lots of lines like this:
> 19:28:07.972 [kafka-thread] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - Resetting offset for partition demo.com_recipient-2-0 to earliest offset.
> 19:28:08.247 [kafka-thread] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - Fetched {timestamp=-1, offset=0} for partition demo.com_recipient-2-0
> Probably you should do that in batch.



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