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From "Jason Gustafson (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (KAFKA-8653) Regression in JoinGroup v0 rebalance timeout handling
Date Thu, 11 Jul 2019 17:20:00 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-8653?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Gustafson resolved KAFKA-8653.
------------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.1

> Regression in JoinGroup v0 rebalance timeout handling
> -----------------------------------------------------
>
>                 Key: KAFKA-8653
>                 URL: https://issues.apache.org/jira/browse/KAFKA-8653
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 2.3.0
>            Reporter: Jason Gustafson
>            Assignee: Jason Gustafson
>            Priority: Blocker
>             Fix For: 2.3.1
>
>
> The rebalance timeout was added to the JoinGroup protocol in version 1. Prior to 2.3,
we handled version 0 JoinGroup requests by setting the rebalance timeout to be equal to the
session timeout. We lost this logic when we converted the API to use the generated schema
definition which uses the default value of -1. The impact of this is that the group rebalance
timeout becomes 0, so rebalances finish immediately after we enter the PrepareRebalance state
and kick out all old members. This causes consumer groups to enter an endless rebalance loop.



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