massakam opened a new pull request #6176: Restore clusterDispatchRate policy 
for compatibility
URL: https://github.com/apache/pulsar/pull/6176
 
 
   ### Motivation
   
   
   The other day, our company upgraded Pulsar from 2.3.2 to 2.4.2. Then, the 
topic-level dispatch throttling no longer works as expected.
   
   This is because the field name that specifies the topic-level dispatch rate 
has been changed by https://github.com/apache/pulsar/pull/4273 from 
`clusterDispatchRate` to `topicDispatchRate`. In Pulsar 2.4.0 or later, 
`clusterDispatchRate` set for the znodes of namespaces is ignored.
   
   The name `topicDispatchRate` is more appropriate than `clusterDispatchRate`, 
but I think the value of `clusterDispatchRate` set in previous versions should 
not be ignored.
   
   ### Modifications
   
   Restored `clusterDispatchRate` field in `Policies` class. If 
`topicDispatchRate` is empty, `clusterDispatchRate` is referred.
   

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