merlimat opened a new pull request #8331:
URL: https://github.com/apache/pulsar/pull/8331
### Motivation
C++ client can end up using a huge amount of memory under certain
conditions:
* Batching enabled
* Number of messages per batch high
* Several partitions
### Modifications
We need to use messages rather than batches for the sizing of the pending
messages queue and back-pressure. Same as how it happens in Java and Go client
implementations. Otherwise, the batching size becomes a multiplier of these
settings.
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