flowchartsman edited a comment on issue #9680:
URL: https://github.com/apache/pulsar/issues/9680#issuecomment-790856013


   It still feels inconsistent. With TTL there is no good backpressure 
strategy, and I am then still stuck with trying to guess whether or not 
backlog-quota fits into TTL time or not, since it is only measured in bytes.
   
   This would also then require me to use retention, TTL _and_ backlog quota, 
and the docs seem to indicate that this is unusual.
   
   Put another way: if retention period can be set only with time, and if 
backlog quota is supposed to be equal to or less than retention, then backlog 
quota should also support being set with only time, otherwise there is no way 
to know that backlog quota is equal to or less than retention period.


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