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https://issues.apache.org/jira/browse/KAFKA-930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13911396#comment-13911396
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Sriram Subramanian commented on KAFKA-930:
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final changes pushed to 0.8.1 and trunk
> Integrate preferred replica election logic into kafka
> -----------------------------------------------------
>
> Key: KAFKA-930
> URL: https://issues.apache.org/jira/browse/KAFKA-930
> Project: Kafka
> Issue Type: Bug
> Reporter: Sriram Subramanian
> Assignee: Sriram Subramanian
> Fix For: 0.8.1
>
> Attachments: KAFKA-930.patch, KAFKA-930_2013-11-19_17:37:29.patch,
> KAFKA-930_2013-11-19_17:38:49.patch, KAFKA-930_2013-11-21_09:42:11.patch,
> KAFKA-930_2013-12-09_22:51:57.patch, KAFKA-930_2013-12-20_11:13:01.patch,
> KAFKA-930_2013-12-20_11:22:36.patch, KAFKA-930_2014-01-27_13:28:51.patch,
> KAFKA-930_2014-02-24_01:59:46.patch
>
>
> It seems useful to integrate the preferred replica election logic into kafka
> controller. A simple way to implement this would be to have a background
> thread that periodically finds the topic partitions that are not assigned to
> the preferred broker and initiate the move. We could come up with some
> heuristics to initiate the move only if the imbalance over a specific
> threshold in order to avoid rebalancing too aggressively. Making the software
> do this reduces operational cost.
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