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Topics (i.e., partitions) are divided among Pulsar brokers. A broker receives messages for a topic and appends them to the topic’s active virtual file (a.k.a ledger), hosted on the Bookkeeper cluster. Brokers read messages from the cache (mostly) or BookKeeper and dispatch them to the consumers. Brokers also receive message acknowledgments and persist them to the BookKeeper cluster as well. Brokers are stateless (don't use/need a disk).

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Apache Pulsar is an all-in-one messaging and streaming platform. Messages can be consumed and acknowledged individually or consumed as streams with less than 10ms of latency. Its layered architecture allows rapid scaling across hundreds of nodes, without data reshuffling.

Pulsar is a Top 10 Apache Software Foundation project and has a vibrant and passionate community and user base spanning small companies and large enterprises.

Pulsar and BookKeeper use Apache ZooKeeper to save metadata coordinated between nodes, such as a list of ledgers per topic, segments per ledger, and mapping of topic bundles to a broker. It’s a cluster of highly available and replicated servers (usually 3).

Its features include multi-tenancy with resource separation and access control, geo-replication across regions, tiered storage and support for six official client languages. It supports up to one million unique topics and is designed to simplify your application architecture.

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A Pulsar client contains a consumer and a producer. A producer writes messages on a topic. A consumer reads messages from a topic and acknowledges specific messages or all up to a specific message.

Apache Pulsar is available under the Apache License, version 2.0. Apache Pulsar is an open-source, distributed messaging and streaming platform built for the cloud.

Apache BookKeeper is a cluster of nodes called bookies. Each virtual file (a.k.a ledger) is divided into consecutive segments, and each segment is kept on 3 bookies by default (replicated by the client - i.e., the broker). Operators can add bookies rapidly since no data reshuffling (moving) between them is required. They immediately share the incoming write load.