📡Apache Pulsar

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Also known as: Pulsar

A cloud-native, distributed messaging and streaming platform supporting multi-tenancy, geo-replication, and tiered storage.

DESCRIPTION

Apache Pulsar unifies messaging and streaming with a server-managed, multi-tenant architecture. It decouples storage and compute using Apache BookKeeper for durable logs and brokers for serving. Pulsar supports flexible subscription modes (exclusive, shared, failover, key_shared) and geo-replication across regions. It offers tiered storage for cost-efficient retention and supports event processing through Pulsar Functions and connectors. Built for high throughput and low latency, Pulsar targets enterprise and cloud-native workloads.

ALTERNATIVE DEFINITIONS

Apache Pulsar

Apache Pulsar is a cloud-native, distributed messaging and streaming platform.

Concise official tagline emphasizing cloud-native and unified messaging/streaming.

Source

StreamNative

Apache Pulsar is a distributed pub-sub messaging system originally created at Yahoo, now a top-level Apache project.

Highlights origin and pub-sub design under Apache governance.

Source

RELATED TERMS

Apache BookKeeper Multi-Region Replication Queue Publish–Subscribe Schema Registry Topic Subscription Stream Processing Tiered Storage

COMPETING TERMS

Apache Kafka RabbitMQ

KNOWLEDGE AREAS

Real-time & Streaming Data Platform & Tooling Data Engineering Infrastructure

TARGET AUDIENCE

Data Engineer Software Developer Cloud Architect DevOps Engineer Data Architect

EXTERNAL SOURCES

• Wikipedia - Apache Pulsar
• Apache Pulsar - Official Pulsar documentation
• Apache Pulsar - Messaging concepts and subscriptions
• StreamNative - Vendor docs and guides for Pulsar

TOP QUESTIONS

Why choose Apache Pulsar over other messaging systems?

Pulsar separates storage and serving, supports multi-tenancy, geo-replication, and tiered storage, offering unified messaging and streaming capabilities.

Category: Relevancy

How does Apache Pulsar store data?

Pulsar uses Apache BookKeeper for durable, replicated log storage, decoupled from stateless brokers.

Category: Design

What subscription modes does Pulsar support?

Exclusive, shared, failover, and key_shared, enabling flexible consumption patterns and scaling.

Category: Features

How does Apache Pulsar support geo-replication?

Clusters can be linked to replicate topics across regions for disaster recovery and local reads.

Category: Operations

What is the difference between Pulsar and Kafka?

Pulsar separates storage via BookKeeper and supports multi-tenancy by design; Kafka couples storage and brokers and often uses external tooling for multi-tenancy.

Category: Alternatives

How can I run Pulsar in production?

Use Kubernetes operators, monitor brokers and BookKeeper, configure retention and tiered storage, and ensure proper authentication and authorization.

Category: Management

Does Pulsar support exactly-once?

Pulsar focuses on at-least-once delivery; exactly-once often depends on processing frameworks and sink semantics.

Category: Misunderstanding

How do Pulsar Functions fit in?

They allow lightweight, server-managed stream processing for transformations and routing without external compute.

Category: Example

Where to start learning Apache Pulsar?

Follow the official getting started guide, deploy a local standalone, and explore messaging concepts and Functions.

Category: Getting Started