Bulk delete components on multiple hosts

The following example shows how to remove components from multiple hosts.

1. Stop components on hosts.

   curl -k -u admin:admin -H "X-Requested-By:ambari" 
   -X PUT --data 
   '{
      "RequestInfo":{
         "context":"Stop components on hosts"
      },
      "Body":{
         "HostRoles":{
            "state":"INSTALLED"
         }
      }
   }' "$HTTP_PROTOCOL://$CONSOLE_NODE:$PORT/api/v1/clusters/$CLUSTER/host_components?HostRoles/component_name.in(DATANODE,HBASE_REGIONSERVER)&HostRoles/host_name.in(c7301.ambari.apache.org,c7302.ambari.apache.org)"

   
   Ambari returns a request status URL to be polled for execution results. You can also review the result from Ambari web UI.

   {
     "href" : "http://c7301.ambari.apache.org:8080/api/v1/clusters/MyCluster/requests/40",
     "Requests" : {
       "id" : 40,
       "status" : "Accepted"
     }
   }

2. Delete components on hosts once the components are stopped. You will receive an error message from Ambari server if you attempt to delete components that are still running.

   curl -k -u admin:admin -H "X-Requested-By: ambari" -X DELETE 
   "$HTTP_PROTOCOL://$CONSOLE_NODE:$PORT/api/v1/clusters/$CLUSTER/host_components?HostRoles/component_name.in(DATANODE,HBASE_REGIONSERVER)&HostRoles/host_name.in(c7301.ambari.apache.org,c7302.ambari.apache.org)"

    

   1. Result of a successful delete

      {
        "deleteResult" : [
          {
            "deleted" : {
              "key" : "c7301.ambari.apache.org/DATANODE"
            }
          },
          {
            "deleted" : {
              "key" : "c7302.ambari.apache.org/DATANODE"
            }
          },
          {
            "deleted" : {
              "key" : "c7302.ambari.apache.org/HBASE_REGIONSERVER"
            }
          },
          {
            "deleted" : {
              "key" : "c7301.ambari.apache.org/HBASE_REGIONSERVER"
            }
          }
        ]
      }
      
      

   2. Error when trying to delete running components

      {
        "deleteResult" : [
          {
            "error" : {
              "key" : "c7301.ambari.apache.org/DATANODE",
              "code" : 500,
             
       "message" : "org.apache.ambari.server.AmbariException: Host Component 
      cannot be removed, clusterName=MyCluster, serviceName=HDFS, 
      componentName=DATANODE, hostname=c7301.ambari.apache.org, request={ clusterName=MyCluster, serviceName=HDFS, componentName=DATANODE, hostname=c7301.ambari.apache.org,
       publicHostname=null, desiredState=null, state=null, 
      desiredStackId=null, staleConfig=null, adminState=null, 
      maintenanceState=null}"
            }
          },
          {
            "error" : {
              "key" : "c7302.ambari.apache.org/DATANODE",
              "code" : 500,
             
       "message" : "org.apache.ambari.server.AmbariException: Host Component 
      cannot be removed, clusterName=MyCluster, serviceName=HDFS, 
      componentName=DATANODE, hostname=c7302.ambari.apache.org, request={ clusterName=MyCluster, serviceName=HDFS, componentName=DATANODE, hostname=c7302.ambari.apache.org,
       publicHostname=null, desiredState=null, state=null, 
      desiredStackId=null, staleConfig=null, adminState=null, 
      maintenanceState=null}"
            }
          },
          {
            "error" : {
              "key" : "c7302.ambari.apache.org/HBASE_REGIONSERVER",
              "code" : 500,
             
       "message" : "org.apache.ambari.server.AmbariException: Host Component 
      cannot be removed, clusterName=MyCluster, serviceName=HBASE, 
      componentName=HBASE_REGIONSERVER, hostname=c7302.ambari.apache.org, request={ clusterName=MyCluster, serviceName=HBASE, componentName=HBASE_REGIONSERVER, hostname=c7302.ambari.apache.org,
       publicHostname=null, desiredState=null, state=null, 
      desiredStackId=null, staleConfig=null, adminState=null, 
      maintenanceState=null}"
            }
          },
          {
            "error" : {
              "key" : "c7301.ambari.apache.org/HBASE_REGIONSERVER",
              "code" : 500,
             
       "message" : "org.apache.ambari.server.AmbariException: Host Component 
      cannot be removed, clusterName=MyCluster, serviceName=HBASE, 
      componentName=HBASE_REGIONSERVER, hostname=c7301.ambari.apache.org, request={ clusterName=MyCluster, serviceName=HBASE, componentName=HBASE_REGIONSERVER, hostname=c7301.ambari.apache.org,
       publicHostname=null, desiredState=null, state=null, 
      desiredStackId=null, staleConfig=null, adminState=null, 
      maintenanceState=null}"
            }
          }
        ]
      }