Master KIP

KIP-500: Replace ZooKeeper with a Self-Managed Metadata Quorum (Accepted)

Status

Current state: Under Discussion

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For whatever result the controller replies to the inner request, the forwarding broker won't check. As long as the top level has no error, the forwarding broker will claim the request to be successful and reply the inner response to the admin client for the rest of error handling.

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Monitoring Metrics

To effectively monitor the request forwarding status, we would add two metrics: request-forwarding-to-controller-rate and request-fowarding-to-controller-count to visualize the progress.

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In the long term after bridge release, we could potentially perform some incompatible changes to the Raft Quorum. To monitor the old client connections to better capture the timing for a major version bump, we shall also expose a metric called old-client-connections-count beyond KIP-511. This metric will record those clients whose version is older than the first KIP-511 supported client, as they have no self identity to propose  KIP-511 also has already exposed metrics like an "unknown" software name and an "unknown" software version.

Compatibility, Deprecation, and Migration Plan

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