tomscut opened a new pull request #4057:
URL: https://github.com/apache/hadoop/pull/4057


   During the restart of Namenode, a Datanode is not registered, but this 
Datanode triggers FBR, which causes NPE.
   
   
![image](https://user-images.githubusercontent.com/55134131/157443088-fddf4452-f783-47d3-9e92-b38c9a97c412.png)
   


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