merlimat opened a new pull request #9650:
URL: https://github.com/apache/pulsar/pull/9650
### Motivation
Allow to set the producer queue size to 0 and disable the limit, just
relying on the `ClientBuilder.memoryLimit()` setting to apply the backpressure.
This will greatly simplify the producer configuration tuning to achieve high
throughput on topics with many partitions.
### Modifications
* Set the producer semaphore as optional
* Changed the queue into a non concurrent `ArrayDeque`, since we're using
it always from within the producer
* Removed `pendingCallbacks` queue, which was there since forever but was
completely useless.
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