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Cloudflare Meerkat - Globally distributed consensus (blog.cloudflare.com)

256 points by bobnamob · 3 days ago · 52 comments on HN

Article summary

Cloudflare is developing a new distributed consensus service called Meerkat, which uses the QuePaxa consensus algorithm to provide strong consistency and fault tolerance. Meerkat is designed to manage control-plane state across Cloudflare's global network and is currently in the experimental phase. The QuePaxa algorithm differs from traditional consensus algorithms like Raft in that it does not rely on leaders or timeouts, allowing all replicas to perform writes at all times. This approach is intended to improve availability and reduce the impact of network failures and latency.

Main themes

  • Distributed Consensus
  • Fault Tolerance
  • Cloudflare Meerkat
  • QuePaxa Algorithm
  • Raft vs QuePaxa
  • Leaderless Consensus

What commenters say

  • The article's focus on Meerkat's advantages over Raft is misleading, as Raft is a leader-based algorithm and Meerkat is leaderless, making them incomparable.
  • The use of QuePaxa's asynchronous consensus algorithm is a novel approach that could provide better performance and availability in certain scenarios.
  • Most teams that recognize the need for a distributed system often opt for simpler solutions, such as using a single node, rather than implementing a complex consensus algorithm.
  • The article's lack of discussion on QuePaxa's implementation and performance in production is a significant omission, making it difficult to assess Meerkat's potential benefits.
  • The development of custom consensus algorithms like Meerkat is necessary for large-scale distributed systems, as off-the-shelf solutions may not meet specific requirements.
  • The FLP impossibility result suggests that consensus without timeouts is impossible, but probabilistic approaches like QuePaxa can still provide liveness with high probability.
  • The article's comparison to Raft is unfair, as Raft is designed for a different use case and has its own strengths and weaknesses.
  • The potential benefits of Meerkat and QuePaxa, such as improved availability and reduced latency, make them worth exploring for large-scale distributed systems.