[GitHub] [pulsar] sijie commented on issue #6787: Using Readers still causes backlog quota to be observed

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

sijie commented on issue #6787:
URL: https://github.com/apache/pulsar/pull/6787#issuecomment-618196829


   @jerrypeng @merlimat I think this should be a flag to allow people to choose whether to include readers for backlog quota consideration or not. The behavior of a non-durable cursor reading a managed ledger should be close to the behavior of a file reader reading a file in the filesystem. If a reader is actively reading a file, the file is still accessible even it is deleted. If there is a reader active in the manager ledger, the data shouldn't be deleted if the reader hasn't read it. Otherwise, it is a violation of the correctness of a "distributed log". 
   
   Thus, this behavior shouldn't be changed by default. If there is a requirement of excluding readers from backlog consideration, we should use a setting to let people opt-in this feature.


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