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From "Jason Gustafson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5611) One or more consumers in a consumer-group stop consuming after rebalancing
Date Thu, 20 Jul 2017 05:05:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16094176#comment-16094176
] 

Jason Gustafson commented on KAFKA-5611:
----------------------------------------

[~pskianis] Thanks for the report. If at all possible, can you try to reproduce this with
DEBUG logging enabled? It would also be helpful to see a thread dump from the hanging consumer.
Especially puzzling that it recovers after any of the consumers is restarted...

> One or more consumers in a consumer-group stop consuming after rebalancing
> --------------------------------------------------------------------------
>
>                 Key: KAFKA-5611
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5611
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.10.2.0
>            Reporter: Panos Skianis
>         Attachments: kka02, Server 1, Server 2, Server 3
>
>
> Scenario: 
>   - 3 zookeepers, 4 Kafkas. 0.10.2.0, with 0.9.0 compatibility still on (other apps need
it but the one mentioned below is already on kafka 0.10.2.0  client).
>   - 3 servers running 1 consumer each under the same consumer groupId. 
>   - Servers seem to be consuming messages happily but then there is a timeout to an external
service that causes our app to restart the Kafka Consumer on one of the servers (this is by
design). That causes rebalancing of the group and upon restart of one of the Consumers seem
to "block".
>   - Server 3 is where the problems occur.
>   - Problem fixes itself either by restarting one of the 3 servers or cause the group
to rebalance again by using the console consumer with the autocommit set to false and using
the same group.
>  
> Note: 
>  - Haven't managed to recreate it at will yet.
>  - Mainly happens in production environment, often enough. Hence I do not have any logs
with DEBUG/TRACE statements yet.
>  - Extracts from log of each app server are attached. Also the log of the kafka that
seems to be dealing with the related group and generations.
>  - See COMMENT lines in the files for further info.



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