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Apache Pulsar is an open-source distributed pub-sub messaging system originally
created at Yahoo and now part of the Apache Software Foundation.

Read the docs GitHub

Key features

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Apache Pulsar is an effort undergoing incubation at The Apache Software Foundation (ASF) sponsored by the Apache Incubator PMC. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.

Apache Pulsar (incubating) is available under the Apache License, version 2.0.