List the core components of a Pulsar cluster?

A Pulsar cluster is built from four core pieces: brokers (stateless, handle pub-sub traffic), bookies (BookKeeper nodes providing durable storage), a metadata store (cluster coordination and ownership state), and optionally a proxy layer (a stateless gateway fronting brokers for client connections).

Brokers and bookies scale independently of each other - you can add bookies to grow storage capacity without touching broker count, or add brokers to grow serving/compute capacity without adding storage.

This separation is the architectural core that differentiates Pulsar's operational model from a system where each node handles both serving and storage together.

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