[jira] [Created] (HDFS-16505) Setting safemode should not be interrupted by abnormal nodes

["tomscut (Jira)" <ji...@apache.org>]

tomscut created HDFS-16505:
------------------------------

             Summary: Setting safemode should not be interrupted by abnormal nodes
                 Key: HDFS-16505
                 URL: https://issues.apache.org/jira/browse/HDFS-16505
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: tomscut
            Assignee: tomscut
         Attachments: image-2022-03-15-09-29-36-538.png, image-2022-03-15-09-29-44-430.png

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 {color:#FF0000}NS1 {color}process exits, setting the states of safemode, {color:#FF0000}NS2{color}, {color:#FF0000}NS3{color}, and {color:#FF0000}NS4 {color}fails. Similarly, when the {color:#FF0000}NS2{color} process exits, only the safemode state of {color:#FF0000}NS1{color} can be set successfully.

 

When the {color:#FF0000}NS1{color} process exits:

Before the change:

!image-2022-03-15-09-29-36-538.png|width=1145,height=97!

After the change:

!image-2022-03-15-09-29-44-430.png|width=1104,height=119!

 



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