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Hadoop NameNode JMX REST Query for NameNodeStatus
> curl 'http://172.20.11.177:50070/jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus'
{
"beans" : [ {
"name" : "Hadoop:service=NameNode,name=NameNodeStatus",
"modelerType" : "org.apache.hadoop.hdfs.server.namenode.NameNode",
"State" : "active",
"NNRole" : "NameNode",
"HostAndPort" : "localhost:19000",
"SecurityEnabled" : false,
"LastHATransitionTime" : 0
} ]
# "State" is "initializing", "active", "standby" or "stopping".
# "LastHATransitionTime" is the last time of the last flip from standby to active (or vice versa)
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