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How to find active namenode from cli

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Contributor

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

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Contributor

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Contributor

Thanks to @vamsi_redd for helping us with Ambari API.

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

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Expert Contributor

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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