Viktor Somogyi-Vass created KAFKA-9166:
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Summary: 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
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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