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https://issues.apache.org/jira/browse/KAFKA-9166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17069351#comment-17069351
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jacky commented on KAFKA-9166:
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it is a patch available?
> Implement MetadataFetch API
> ---------------------------
>
> Key: KAFKA-9166
> URL: https://issues.apache.org/jira/browse/KAFKA-9166
> Project: Kafka
> Issue Type: Sub-task
> Components: controller
> Reporter: Viktor Somogyi-Vass
> Assignee: Colin McCabe
> Priority: Major
>
> Brief description of the ask is mentioned in KIP-500's
> [BrokerMetadataManagement|https://cwiki.apache.org/confluence/display/KAFKA/KIP-500%3A+Replace+ZooKeeper+with+a+Self-Managed+Metadata+Quorum#KIP-500:ReplaceZooKeeperwithaSelf-ManagedMetadataQuorum-BrokerMetadataManagement]
> Instead of the controller pushing out updates to the other brokers, those
> brokers will fetch updates from the active controller via the new
> MetadataFetch API.
> A MetadataFetch is similar to a fetch request. Just like with a fetch
> request, the broker will track the offset of the last updates it fetched, and
> only request newer updates from the active controller.
> The broker will persist the metadata it fetched to disk. This will allow the
> broker to start up very quickly, even if there are hundreds of thousands or
> even millions of partitions. (Note that since this persistence is an
> optimization, we can leave it out of the first version, if it makes
> development easier.)
> Most of the time, the broker should only need to fetch the deltas, not the
> full state. However, if the broker is too far behind the active controller,
> or if the broker has no cached metadata at all, the controller will send a
> full metadata image rather than a series of deltas.
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