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Posted to dev@kafka.apache.org by "Neha Narkhede (JIRA)" <ji...@apache.org> on 2012/09/25 20:36:08 UTC

[jira] [Work started] (KAFKA-532) Multiple controllers can co-exist during soft failures

     [ https://issues.apache.org/jira/browse/KAFKA-532?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on KAFKA-532 started by Neha Narkhede.

> Multiple controllers can co-exist during soft failures
> ------------------------------------------------------
>
>                 Key: KAFKA-532
>                 URL: https://issues.apache.org/jira/browse/KAFKA-532
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.8
>            Reporter: Neha Narkhede
>            Assignee: Neha Narkhede
>            Priority: Blocker
>              Labels: bugs
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> If the current controller experiences an intermittent soft failure (GC pause) in the middle of leader election or partition reassignment, a new controller might get elected and start communicating new state change decisions to the brokers. After recovering from the soft failure, the old controller might continue sending some stale state change decisions to the brokers, resulting in unexpected failures. We need to introduce a controller generation id that increments with controller election. The brokers should reject any state change requests by a controller with an older generation id.

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