Explain advanced distributed consensus algorithms and coordination systems relevant to PHP architectures.

Distributed consensus algorithms coordinate agreement across unreliable distributed systems despite failures and partitions.

Distributed systems require coordination for:

However, distributed environments face:

Consensus algorithms solve coordinated agreement.

Core algorithms:

Theoretical foundation for distributed consensus. Complex but highly influential.

Simpler consensus algorithm emphasizing understandability. Widely used today.

ZooKeeper Atomic Broadcast.

Consensus guarantees:…