hdfs get active name node

when programming out of hadoop cluster ,
if name-node is standby, connecting hdfs and any command fails.

http://{0}:{1}/jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus

from stackoverflow ( http://stackoverflow.com/questions/26648214/any-command-to-get-active-namenode-for-nameservice-in-hadoop )

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