hi all   the following ambari API will stop only the data-nodes on workers machines   # curl -s -u admin:admin -H "X-Requested-By: ambari" -X PUT -d '{"RequestInfo":{"context":"Stop DataNodes","operation_level":{"level":"SERVICE","cluster_name":"$CLUSTER_NAME"},"query":"HostRoles/component_name=DATANODE&HostRoles/host_name.in(dn1.example.com,dn2.example.com,dn3.example.com)&HostRoles/maintenance_state=OFF"},"Body":{"HostRoles":{"state":"INSTALLED"}}}' "h ttp://$AMBARI_FQDN:8080/api/v1/clusters/$CLUSTER_NAME/host_components"   now we want to replace the list - n1.example.com,dn2.example.com,dn3.example.com   with variable - DATANODES=n1.example.com,dn2.example.com,dn3.example.com   so $DATANODES will replce the list in the API as the following     # curl -s -u admin:admin -H "X-Requested-By: ambari" -X PUT -d '{"RequestInfo":{"context":"Stop DataNodes","operation_level":{"level":"SERVICE","cluster_name":"$CLUSTER_NAME"},"query":"HostRoles/component_name=DATANODE&HostRoles/host_name.in($DATANODES)&HostRoles/maintenance_state=OFF"},"Body":{"HostRoles":{"state":"INSTALLED"}}}' "h ttp://$AMBARI_FQDN:8080/api/v1/clusters/$CLUSTER_NAME/host_components"     but this isn't working , any advice how to set it correctly ? ... View more

hi all     we have two master machines    master01 master02     on both machines yarn resource manager is running as active/standby )   how to verify which machine is with active resource manager by ambari rest api ?  ... View more

hi all     in ambari we have the following hive components      how to stop Hive Metastore and HiveServer2 by cli  ? ... View more

hi all what could be the reason that sometimes we get - REASON: Server not yet listening on http port 8080 when we start the ambari server and sometimes its start successfully ?   ambari-server start Using python /usr/bin/python Starting ambari-server Ambari Server running with administrator privileges. Organizing resource files at /var/lib/ambari-server/resources... Ambari database consistency check started... Server PID at: /var/run/ambari-server/ambari-server.pid Server out at: /var/log/ambari-server/ambari-server.out Server log at: /var/log/ambari-server/ambari-server.log Waiting for server start............................................................ DB configs consistency check: no errors and warnings were found. ERROR: Exiting with exit code 1. REASON: Server not yet listening on http port 8080 after 50 seconds. Exiting.   # ambari-server start Using python /usr/bin/python Starting ambari-server Ambari Server running with administrator privileges. Organizing resource files at /var/lib/ambari-server/resources... Ambari database consistency check started... Server PID at: /var/run/ambari-server/ambari-server.pid Server out at: /var/log/ambari-server/ambari-server.out Server log at: /var/log/ambari-server/ambari-server.log Waiting for server start....................................... Server started listening on 8080 DB configs consistency check: no errors and warnings were found. Ambari Server 'start' completed successfully. ... View more