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

1. Stop components on hosts.

   Code Block
   language bash
   curl -k -u admin:admin -H "X-Requested-By:ambari" -i -X PUTX 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)" --data '{"RequestInfo":{"context":"Stop components on hosts"},"Body":{"HostRoles":{"state":"INSTALLED"}}}'

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

   Code Block
   language bash
   { "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.

   Code Block
   language bash
   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

      Code Block
      language bash
      { "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

      Code Block
      language bash
      { "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}" } } ] }

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