Jennifer88huang opened a new issue #6058: [docs] Add docs to specify whether the consumer push or pull URL: https://github.com/apache/pulsar/issues/6058 **Describe the bug** > Does the consumer push or pull? It looks like pull but I didn't see that in the docs. The wire protocol is actually *push*. The client sends "permits" to the broker to ask for messages. The broker will push the requested number of messages to the consumer. > Since it is pull and the receive call only receives 1 message at a time, is there a buffer to it? E.g. you can receive and that buffers 4096 bytes and then gives you one message at a time out of the buffer. There is a queue at the consumer side to receive messages pushed from broker. The queue size is configurable by `receiveQueueSize`. Each time `consumer#receive` is called. A message is dequeued from the buffer. > Mateo's post https://dzone.com/articles/a-developers-introduction-to-the-pulsar-streaming says it is a pull: > producers push dat$$anonymous$$nd from which consumers pull data. From API perspective, it is a "pull". But at the wire protocol layer, it is a "push" + client side queue. This behavior was never changed.
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