hrsakai opened a new pull request #6106: Fix available permits may be greater than 1 even though queue size is 0. URL: https://github.com/apache/pulsar/pull/6106 ### Motivation Available permits of ZeroQueueConsuemer must be 1 or less, however ZeroQueueConsuemer using listener may be greater than 1. ### Modifications If listener is processing message, ZeroQueueConsumer doesn't send permit when it reconnect to broker. ### Reproduction 1. ZeroQueueConsuemer using listener consume a topic. 2. Unload that topic( or restart a broker) when listener is processing message. 3. ZeroQueueConsumer sends permit when it reconnect to broker. https://github.com/apache/pulsar/blob/v2.5.0/pulsar-client/src/main/java/org/apache/pulsar/client/impl/ZeroQueueConsumerImpl.java#L133 4. ZeroQueueConsumer also sends permit when finished processing message. https://github.com/apache/pulsar/blob/v2.5.0/pulsar-client/src/main/java/org/apache/pulsar/client/impl/ZeroQueueConsumerImpl.java#L163 5. Available permits become 2.
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