[GitHub] [pulsar-client-cpp] shibd opened a new issue, #93: [feature request] C++ and Python client support consumer memory limits.

[GitBox <gi...@apache.org>]

shibd opened a new issue, #93:
URL: https://github.com/apache/pulsar-client-cpp/issues/93

   ### Search before asking
   
   - [X] I searched in the [issues](https://github.com/apache/pulsar/issues) and found nothing similar.
   
   
   ### Motivation
   
   [PIP-74](https://github.com/apache/pulsar/wiki/PIP-74%3A-Pulsar-client-memory-limits)
   
   C++ client consumers have not implemented memory limits yet. 
   
   
   ### Solution
   
   There are several key points to achieving this feature.
   1. Reconstructing the consumer structure.
      - https://github.com/apache/pulsar/pull/16969
      - Abstract `ConsumerBase`, put together some common logic.
   2. Refactoring single-consumer and MultiTopicConsumer transports type.
      - In the current implementation of C++, messages are sent to multi-topic consumers by blocking queue + listener, which is an old historical implementation. If you want to achieve memory limits, you need to do the same as the current java implementation, let `MuiltiTopicConsumer` take the initiative to control the message.
   
   
   ### Alternatives
   
   Here's an imperfect draft: https://github.com/apache/pulsar/pull/16933
   
   ### Anything else?
   
   _No response_
   
   ### Are you willing to submit a PR?
   
   - [x] I'm willing to submit a PR!


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