seniorPHP
Explain advanced distributed consensus algorithms (Raft/Paxos) and their relevance to PHP systems.
Updated May 24, 2026
Short answer
Consensus algorithms ensure distributed nodes agree on a single source of truth, enabling reliable coordination in fault-tolerant systems.
Deep explanation
Distributed systems require agreement despite failures, network partitions, and latency.
- Paxos
- theoretical foundation
- complex but correct
- used in Google systems
- Raft
- simpler, more practical
- leader election
- log replication
- log consistency
Core concepts:
- leader node
- followers
- log replication
- majority quorum
How it relates to PHP systems:
- used indirectly via etcd, Kubernetes
- database clustering
- distributed locking systems
Failure handling:
- node crash recovery
- network partition resolution
- log reconciliation…
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