archfish opened a new issue #6535: [BUG]Msg duplicate when consumer in Failover 
mode
URL: https://github.com/apache/pulsar/issues/6535
 
 
   **Describe the bug**
   Msg duplicate when consumer in Failover mode
   
   **To Reproduce**
   Steps to reproduce the behavior:
   1. create a subscribe name A to topic B
   2. send some message C to topic B
   3. create consumer with subscribe name A in Failover mode, consumer name AA
   4. get message C in consumer AA, an sleep seconds
   5. create consumer with subscribe name A in Failover mode, consumer name BB
   6.  consumer BB get message C
   
   **Expected behavior**
   
   - Do not change active consumer (maybe best)
   
   - Or do not deliver message which already delivered to other consumer
   
   **Screenshots**
   
   
![image](https://user-images.githubusercontent.com/5317064/76604476-bc09d380-6549-11ea-9049-032e48ca3680.png)
   

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