Pulsar is a distributed pub-sub messaging platform with a very flexible messaging model and an intuitive client API.

    Learn more about Pulsar at

    Main features

    • Horizontally scalable (Millions of independent topics and millions of messages published per second)
    • Strong ordering and consistency guarantees
    • Low latency durable storage
    • Topic and queue semantics
    • Load balancer
    • Designed for being deployed as a hosted service:
      • Multi-tenant
      • Authentication
      • Authorization
      • Quotas
      • Support mixing very different workloads
      • Optional hardware isolation
    • Keeps track of consumer cursor position
    • REST API for provisioning, admin and stats
    • Geo replication
    • Transparent handling of partitioned topics
    • Transparent batching of messages


    This repository is the main repository of Apache Pulsar. Pulsar PMC also maintains other repositories for components in the Pulsar ecosystem, including connectors, adapters, and other language clients.

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    Build Pulsar


    • Java JDK 1.8 or Java JDK 11
    • Maven 3.3.9+

    Compile and install:

    $ mvn install -DskipTests

    Minimal build (This skips most of external connectors and tiered storage handlers)

    mvn install -Pcore-modules

    Run Unit Tests:

    $ mvn test

    Run Individual Unit Test:

    $ cd module-name (e.g: pulsar-client)
    $ mvn test -Dtest=unit-test-name (e.g: ConsumerBuilderImplTest)

    Run Selected Test packages:

    $ cd module-name (e.g: pulsar-broker)
    $ mvn test -pl module-name -Dinclude=org/apache/pulsar/**/*.java

    Start standalone Pulsar service:

    $ bin/pulsar standalone

    Check for documentation and examples.

    Setting up your IDE

    Apache Pulsar is using lombok so you have to ensure your IDE setup with required plugins.


    To configure annotation processing in IntelliJ:

    1. Open Annotation Processors Settings dialog box by going to Settings -> Build, Execution, Deployment -> Compiler -> Annotation Processors.

    2. Select the following buttons:

      1. "Enable annotation processing"
      2. "Obtain processors from project classpath"
      3. "Store generated sources relative to: Module content root"
    3. Set the generated source directories to be equal to the Maven directories:

      1. Set "Production sources directory:" to "target/generated-sources/annotations".
      2. Set "Test sources directory:" to "target/generated-test-sources/test-annotations".
    4. Click "OK".

    5. Install the lombok plugin in intellij.


    Follow the instructions here to configure your Eclipse setup.

    Build Pulsar docs

    Refer to the docs README.


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    Pulsar slack channel at

    You can self-register at


    Licensed under the Apache License, Version 2.0:

    Crypto Notice

    This distribution includes cryptographic software. The country in which you currently reside may have restrictions on the import, possession, use, and/or re-export to another country, of encryption software. BEFORE using any encryption software, please check your country's laws, regulations and policies concerning the import, possession, or use, and re-export of encryption software, to see if this is permitted. See for more information.

    The U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this software as Export Commodity Control Number (ECCN) 5D002.C.1, which includes information security software using or performing cryptographic functions with asymmetric algorithms. The form and manner of this Apache Software Foundation distribution makes it eligible for export under the License Exception ENC Technology Software Unrestricted (TSU) exception (see the BIS Export Administration Regulations, Section 740.13) for both object code and source code.

    The following provides more details on the included cryptographic software: Pulsar uses the SSL library from Bouncy Castle written by


    Apache Pulsar is a cloud-native, distributed messaging and streaming platform originally created at Yahoo! and now a top-level Apache Software Foundation



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