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From "Guozhang Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-762) Improve second replica assignment
Date Fri, 22 Feb 2013 17:26:13 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13584461#comment-13584461
] 

Guozhang Wang commented on KAFKA-762:
-------------------------------------

I think that as long as the secondShift is different for two partition, even if their first
replica is assigned to the same broker their following replicas would not be possibly assigned
to the same broker?
                
> Improve second replica assignment
> ---------------------------------
>
>                 Key: KAFKA-762
>                 URL: https://issues.apache.org/jira/browse/KAFKA-762
>             Project: Kafka
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 0.8
>            Reporter: Jun Rao
>            Assignee: Jun Rao
>            Priority: Blocker
>              Labels: p2
>             Fix For: 0.8
>
>         Attachments: kafka-762_v1.patch
>
>
> Currently, for partitions from different topics, if the first replica is assigned to
the same broker, their second replica is also assigned to the same broker. This means that
when a broker fails, many leaders on the failed broker will be moved to the same broker, and
thus introduces more load on that broker.

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