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https://issues.apache.org/jira/browse/KAFKA-923?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jun Rao closed KAFKA-923.
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> Improve controller failover latency
> -----------------------------------
>
> Key: KAFKA-923
> URL: https://issues.apache.org/jira/browse/KAFKA-923
> Project: Kafka
> Issue Type: Improvement
> Components: controller
> Affects Versions: 0.8
> Reporter: Neha Narkhede
> Assignee: Neha Narkhede
> Priority: Critical
> Labels: kafka-0.8
> Fix For: 0.8
>
> Attachments: kafka-923-v1.patch, kafka-923-v2.patch
>
>
> During controller failover, we do the following things -
> 1. Increment controller epoch
> 2. Initialize controller context
> 3. Initialize replica state machine
> 4. Initialize partition state machine
> During step 2 above, we read the information of all topics and partitions,
> the replica assignments and leadership information. During step 3 and 4, we
> re-read some of this information from zookeeper. Since the zookeeper reads
> are proportional to the number of topics and the reads are serial, it is
> important to optimize this. The zookeeper reads in steps 3 and 4 are not
> required.
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