easyfan commented on 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#issuecomment-504393447 Root cause: a simple mistake in pulsar/pulsar-client-cpp/lib/ProducerImpl.cc: The reserved spots for all individual messages in a batch message (just reserved, not occupied by pushing in) did not be released in the case of batching message sent failure (sent timeout or any other failure cases), which was processed by `ProducerImpl::failPendingMessages(...)`
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