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Posted to issues@kvrocks.apache.org by "Paragrf (via GitHub)" <gi...@apache.org> on 2026/04/28 07:17:30 UTC
[PR] feat:Implement Multi-node Quorum-based HA [kvrocks-controller]
Paragrf opened a new pull request, #393:
URL: https://github.com/apache/kvrocks-controller/pull/393
**Background**
To enhance the stability of the Kvrocks system, we have implemented an HA (High Availability) system based on multi-controller consensus.
**Key Changes**
- Voting mechanism: Each controller independently probes every Kvrocks node. Before promoting a new master, the leader collects unanimous votes from all peer controllers via POST /internal/vote. A single NO (or unreachable peer with a live lease) blocks the failover.
- Peer discovery: Controllers register themselves in the store with a heartbeat. ListActivePeers returns peers whose leases are still alive. Expired peers are excluded from quorum rather than blocking failover.
- Observability:Structured zap logging at every vote decision point (round start, per-peer vote with diagnostic fields, round outcome). Seven new Prometheus metrics track failover proposals, completions, blocks, vote round duration, peer count, per-node failure counts, and individual probe failures.
**Related Issues**
#392
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Re: [PR] feat:Implement Multi-node Quorum-based HA [kvrocks-controller]
Posted by "Paragrf (via GitHub)" <gi...@apache.org>.
Paragrf closed pull request #393: feat:Implement Multi-node Quorum-based HA
URL: https://github.com/apache/kvrocks-controller/pull/393
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Re: [PR] feat:Implement Multi-node Quorum-based HA [kvrocks-controller]
Posted by "Paragrf (via GitHub)" <gi...@apache.org>.
Paragrf commented on PR #393:
URL: https://github.com/apache/kvrocks-controller/pull/393#issuecomment-4333141581
mistake
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