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Currently support for more than 2 NameNodes (HDFS-6440) is only in branch-3. This JIRA aims to backport it to branch-2, as this is required by HDFS-12943 (consistent read from standby) backport to branch-2.
Backport HDFS-12943 to branch-2
Support more than 2 NameNodes
Backport HDFS-10536 to branch-2
Backport HADOOP-15684 to branch-2
Consistent Reads from Standby Node
Backport HDFS-9659 to branch-2
Backport HDFS-9787 to branch-2
Backport HDFS-13799 to branch-2