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How to find active namenode from cli

Hi Team,

 

How to find active name node from cli and also want to know where to check automatic namenode failover triggered in the cluster?

3 REPLIES 3

Re: How to find active namenode from cli

New Contributor

Re: How to find active namenode from cli

Thanks to @vamsi_redd for helping us with Ambari API.

Do you have the same API for Cloudera Manager as well?

Re: How to find active namenode from cli

Rising Star

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#resour...

 

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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