GitHub user lhotari edited a comment on the discussion: Negative consumer 
availablePermits

Yes, I've seen this before. Some analysis at 
https://github.com/apache/pulsar/issues/23263 .

I guess it might be related to batch messages and the mitigation could be to 
use `preciseDispatcherFlowControl=true` in broker.conf to more accurately 
dispatch messages to consumers according to the available permits. The other 
option is that there's a bug somewhere when permits handled.

GitHub link: 
https://github.com/apache/pulsar/discussions/24298#discussioncomment-13135896

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