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From "Panos Skianis (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-5611) One or more consumers in a consumer-group stop consuming after rebalancing
Date Thu, 20 Jul 2017 01:10:03 GMT
Panos Skianis created KAFKA-5611:

             Summary: 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:
            Reporter: Panos Skianis
         Attachments: kka02, Server 1, Server 2, Server 3

  - 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.
 - 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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