[GitHub] [hadoop] tomscut opened a new pull request #4071: HDFS-16505. Setting safemode should not be interrupted by abnormal nodes

[GitBox]

tomscut opened a new pull request #4071:
URL: https://github.com/apache/hadoop/pull/4071


   JIRA: [HDFS-16505](https://issues.apache.org/jira/browse/HDFS-16505).
   
   Setting safemode should not be interrupted by abnormal nodes. 
   
   For example, we have four namenodes configured in the following order:
   NS1 -> active
   NS2 -> standby
   NS3 -> observer
   NS4 -> observer.
   
   When the `NS1` process exits, setting the states of safemode, `NS2`, `NS3`, 
and `NS4` fails. Similarly, when the `NS2` process exits, only the safemode 
state of `NS1` can be set successfully.
   
   When the `NS1` process exits:
   Before the change:
   
![image](https://user-images.githubusercontent.com/55134131/158288412-b0915dba-aa69-4e71-a47d-1d7728ba673d.png)
   
   After the change:
   
![image](https://user-images.githubusercontent.com/55134131/158288423-f7de2689-ad0b-455e-9717-1b5ff877f20f.png)
   
   


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