Hi all:
According to the issue (https://github.com/apache/pulsar/issues/15038),
when producer send a message to broker and broker rate-limited at that time,
the request will blocked in buffer, after broker read the message and send
receipt to producer, the producer maybe timeout already.
So, in the case, do we need to provider a new flow-control
strategy(fail-fast)? It can be configurable, when broker in rate-limit, broker
not `disableAutoread` and reply a `FlowControlException` instead.
Thanks,
Tao Jiuming
