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apache pulsar skip to main content apache pulsar 4 2 is here get started concepts quickstart ecosystem client libraries docs features use cases community welcome discussions governance meet the community contribute contribution guide wiki issue tracking learn blog books case studies articles presentations events download search apache pulsar cloud native distributed messaging and streaming apache pulsar is an open source distributed messaging and streaming platform built for the cloud explore docs quickstart pulsar is proven at scale by hundreds of companies of different sizes serving millions of messages per second see case studies what is pulsar 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 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 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 features rapid horizontal scalability scales horizontally to handle the increased load its unique design and separate storage layer enable handling the sudden surge in traffic by scaling out in seconds low latency messaging and streaming acknowledge messages individually rabbitmq style or cumulative per partition i e offset like enables use cases such as distributed work queues or order preserving data streams at very large scales hundreds of nodes and low latency 10ms seamless geo replication protect against complete zone outages using replication across different geographic regions flexible and configurable replication strategies across distant pulsar clusters uniquely supports automatic client failover to healthy clusters multi tenancy as a first class citizen maintain one cluster for your entire organization using tenants access control across data and actions using tenant policies isolate specific brokers to a tenant when maximum noisy neighbor protection is needed automatic load balancing add or remove nodes and let pulsar load balance topic bundles automatically hot spotted topic bundles are automatically split and evenly distributed across the brokers official multi language support officially maintained pulsar clients for java go python c node js and c official 3rd party integrations pulsar has officially maintained connectors with popular 3rd parties mysql elasticsearch cassandra and more allows streaming data in source or out sink serverless functions write and deploy functions natively using pulsar functions process messages using java go or python without deploying fully fledged applications kubernetes runtime is bundled supports up to 1m topics pulsar s unique architecture supports up to 1 million topics in a single cluster simplify your own architecture by avoiding multiplexing multiple streams into a single topic explore more features how does pulsar work producer consumer 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 zookeeper 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 pulsar brokers 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 apache bookkeeper 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 pulsar use cases a combination of unique and common use cases sets pulsar apart from other message brokers pulsar trusted community join us and start contributing 14800 github view 740 contributors view 10750 slack members join pulsar users run in production at scale with millions of messages per second across millions of topics pulsar is now used by thousands of companies for real time workloads see case studies foundation events license thanks sponsorship security privacy contact the apache software foundation 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 copyright 2026 the apache software foundation all rights reserved apache pulsar apache pulsar and the apache feather logo are trademarks or registered trademarks of the apache software foundation