pip/pip-120.md
In Pulsar 2.8, we have introduced a setting to control the amount of memory used by a client instance.
interface ClientBuilder {
ClientBuilder memoryLimit(long memoryLimit, SizeUnit unit);
}
By default, in 2.8 and 2.9 this setting is set to 0, meaning no limit is being enforced.
I think it's a good time for 2.10 to enable this setting by default and, correspondingly, to disable by default the producer queue size limit.
This will simplify a lot the configuration that a producer application will have to come up with, when publishing with many topic/partitions or when messages are bigger than expected.
In 2.10 release, for the ClientBuilder, change
* memoryLimit: 0 -> 64 MB
For the ProducerBuilder, changes
* maxPendingMessages: 1000 -> 0
64MB is picked because it's a small enough memory size that will guarantee a very high producer throughput, irrespective of the individual messages size.