hehuiyuan opened a new pull request #15395:
URL: https://github.com/apache/flink/pull/15395


   ## What is the purpose of the change
   
   At the moment, we allow zero value for the TTL incremental cleanup size.
   Although technically zero value will not break the cleanup but practically 
there will be no cleanup.
   We change cleanupSize to be strictly greater than zero to avoid confusion.
   
![image](https://user-images.githubusercontent.com/18002496/70502733-98a34700-1b5c-11ea-8b68-88b8ac4f1c80.png)
   
![image](https://user-images.githubusercontent.com/18002496/70502745-9fca5500-1b5c-11ea-89fd-a1bc2486cc1c.png)
   
   
   
   


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