Chao Sun created HDFS-13286:
-------------------------------

             Summary: Add haadmin commands to transition between standby and 
observer
                 Key: HDFS-13286
                 URL: https://issues.apache.org/jira/browse/HDFS-13286
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Chao Sun
            Assignee: Chao Sun


As discussed in HDFS-12975, we should allow explicit transition between standby 
and observer through haadmin command, such as:
{code}
haadmin -transitionToObserver
{code}

Initially we should support transition from observer to standby, and standby to 
observer.



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