How to find active namenode from cli

Hello @khanarshadazmat ,

You may get the role information using CM API for HDFS service.

API: 

https://archive.cloudera.com/cm7/7.2.4/generic/jar/cm_api/apidocs/resource_RolesResource.html#resource_RolesResource_ClustersResourceV43_ServicesResourceV42_RolesResourceV41_readRoles_GET

See the below example for a better understanding:

• When I execute the above API, I would get the below details for HDFS service:

"name" : "HDFS-1-NAMENODE-cb7144bc695976e34cfbaaf26c176d21",
"type" : "NAMENODE",
"serviceRef" : {
"clusterName" : "Cluster 1",
"serviceName" : "HDFS-1",
"serviceDisplayName" : "HDFS-1",
"serviceType" : "HDFS"
},
...
"roleState" : "STARTED",
"healthSummary" : "GOOD",
"configStalenessStatus" : "FRESH",
"haStatus" : "STANDBY",
"maintenanceMode" : false,
"commissionState" : "COMMISSIONED",
"roleConfigGroupRef" : {
"roleConfigGroupName" : "HDFS-1-NAMENODE-BASE"
},

• and, for the second namenode, I'll get something as below:

"name" : "HDFS-1-NAMENODE-b1d777dd6714507397225b07ea9057ce",
"type" : "NAMENODE",
"serviceRef" : {
"clusterName" : "Cluster 1",
"serviceName" : "HDFS-1",
"serviceDisplayName" : "HDFS-1",
"serviceType" : "HDFS"
},
...
"roleState" : "STARTED",
"healthSummary" : "GOOD",
"configStalenessStatus" : "FRESH",
"haStatus" : "ACTIVE",
"maintenanceMode" : false,
"commissionState" : "COMMISSIONED",
"roleConfigGroupRef" : {
"roleConfigGroupName" : "HDFS-1-NAMENODE-BASE"
},
"entityStatus" : "GOOD_HEALTH"

• In both the above examples, check for the keyword "haStatus". The namenode with haStatus as Active would be your Active Namenode. 

Let me know if this helps.

Cheers!

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