easyfan opened a new issue #4569: C++ client producer sendAsync() method will be blocked forever, if enough batched messages sent timeout. URL: https://github.com/apache/pulsar/issues/4569 **Describe the bug** C++ client producer sendAsync() method will be blocked forever, if enough batched messages sent timeout. **To Reproduce** 1. Using the following producer configures: setBatchingEnabled(true) setBlockIfQueueFull(true) setSendTimeout(100) (shorter timeout interval would help reproduce the issue) 2. Producing huge plant of messages (better in a pressure test env.); 3. Try to made some producer timeout happens (with shorter timeout interval for example) 4. After accumulating enough timeout captured, the pulsar::Producer::sendAsync method will be blocked and will nerver turned back to available. **Expected behavior** The method pulsar::Producer::sendAsync(...) might be blocked for a while, if the pending messages reached the max value, but it shall be returned back available if previous pending messages acked or reaching timeout point. **Desktop (please complete the following information):** - OS: Centos
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