Chao Sun created HDFS-13182:

             Summary: Allow Observer to participate in NameNode failover
                 Key: HDFS-13182
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha, namenode
            Reporter: Chao Sun

As discussed in the design doc, when there is no SBN available, Observer should 
be eligible for namenode failover. See HDFS-12975 for some preliminary findings 
in this effort.

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