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Posted to reviews@ambari.apache.org by Swapan Shridhar <ss...@hortonworks.com> on 2017/12/04 21:45:13 UTC

Re: Review Request 63965: New endpoint service_config_version for creating new config versions via service endpoint instead of cluster update

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https://reviews.apache.org/r/63965/#review192775
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Ship it!




Ship It!

- Swapan Shridhar


On Nov. 22, 2017, 5:47 p.m., Madhuvanthi Radhakrishnan wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/63965/
> -----------------------------------------------------------
> 
> (Updated Nov. 22, 2017, 5:47 p.m.)
> 
> 
> Review request for Ambari, Jayush Luniya, Swapan Shridhar, and Vitalyi Brodetskyi.
> 
> 
> Bugs: AMBARI-22487
>     https://issues.apache.org/jira/browse/AMBARI-22487
> 
> 
> Repository: ambari
> 
> 
> Description
> -------
> 
> Create new service config version
> POST
> api/v2/clusters/<cluster-name>/servicegroups/<service-group-name>/services/<service-name>/configurations/service_config_versions
> 
> 
> Diffs
> -----
> 
>   ambari-server/src/main/java/org/apache/ambari/server/api/services/ConfigurationService.java 79128a2374 
>   ambari-server/src/main/java/org/apache/ambari/server/api/services/ServiceConfigVersionService.java c6e320121f 
>   ambari-server/src/main/java/org/apache/ambari/server/controller/AmbariManagementController.java b5bc813e9c 
>   ambari-server/src/main/java/org/apache/ambari/server/controller/AmbariManagementControllerImpl.java 875d9b6f9f 
>   ambari-server/src/main/java/org/apache/ambari/server/controller/ServiceConfigVersionRequest.java 29a7a421cd 
>   ambari-server/src/main/java/org/apache/ambari/server/controller/internal/ServiceConfigVersionResourceProvider.java cbc08ebdf4 
> 
> 
> Diff: https://reviews.apache.org/r/63965/diff/2/
> 
> 
> Testing
> -------
> 
> mvn clean install -DskipTests=true -Dmaven.test.skip=true -X
> [INFO] Reactor Summary:
> [INFO]
> [INFO] Ambari Main ........................................ SUCCESS [ 20.681 s]
> [INFO] Apache Ambari Project POM .......................... SUCCESS [  0.047 s]
> [INFO] Ambari Web ......................................... SUCCESS [ 59.888 s]
> [INFO] Ambari Views ....................................... SUCCESS [  1.454 s]
> [INFO] Ambari Admin View .................................. SUCCESS [  9.794 s]
> [INFO] ambari-utility ..................................... SUCCESS [  4.461 s]
> [INFO] ambari-metrics ..................................... SUCCESS [  1.585 s]
> [INFO] Ambari Metrics Common .............................. SUCCESS [  5.107 s]
> [INFO] Ambari Metrics Hadoop Sink ......................... SUCCESS [  3.697 s]
> [INFO] Ambari Metrics Flume Sink .......................... SUCCESS [  3.057 s]
> [INFO] Ambari Metrics Kafka Sink .......................... SUCCESS [  3.088 s]
> [INFO] Ambari Metrics Storm Sink .......................... SUCCESS [  2.462 s]
> [INFO] Ambari Metrics Storm Sink (Legacy) ................. SUCCESS [  2.196 s]
> [INFO] Ambari Metrics Collector ........................... SUCCESS [ 20.644 s]
> [INFO] Ambari Metrics Monitor ............................. SUCCESS [  2.597 s]
> [INFO] Ambari Metrics Grafana ............................. SUCCESS [  5.799 s]
> [INFO] Ambari Metrics Host Aggregator ..................... SUCCESS [  5.548 s]
> [INFO] Ambari Metrics Assembly ............................ SUCCESS [01:48 min]
> [INFO] Ambari Service Advisor ............................. SUCCESS [  0.614 s]
> [INFO] Ambari Server ...................................... SUCCESS [03:49 min]
> [INFO] Ambari Functional Tests ............................ SUCCESS [  0.494 s]
> [INFO] Ambari Agent ....................................... SUCCESS [ 50.352 s]
> [INFO] Ambari Client ...................................... SUCCESS [  0.100 s]
> [INFO] Ambari Python Client ............................... SUCCESS [  0.896 s]
> [INFO] Ambari Groovy Client ............................... SUCCESS [  1.600 s]
> [INFO] Ambari Shell ....................................... SUCCESS [  0.101 s]
> [INFO] Ambari Python Shell ................................ SUCCESS [  0.699 s]
> [INFO] Ambari Groovy Shell ................................ SUCCESS [  0.756 s]
> [INFO] ambari-logsearch ................................... SUCCESS [  3.196 s]
> [INFO] Ambari Logsearch Appender .......................... SUCCESS [  0.303 s]
> [INFO] Ambari Logsearch Config Api ........................ SUCCESS [  0.242 s]
> [INFO] Ambari Logsearch Config Zookeeper .................. SUCCESS [  0.352 s]
> [INFO] Ambari Logsearch Log Feeder ........................ SUCCESS [  4.504 s]
> [INFO] Ambari Logsearch Web ............................... SUCCESS [01:10 min]
> [INFO] Ambari Logsearch Server ............................ SUCCESS [  8.842 s]
> [INFO] Ambari Logsearch Assembly .......................... SUCCESS [  0.206 s]
> [INFO] Ambari Logsearch Integration Test .................. SUCCESS [  0.299 s]
> [INFO] ambari-infra ....................................... SUCCESS [  0.198 s]
> [INFO] Ambari Infra Solr Client ........................... SUCCESS [  2.149 s]
> [INFO] Ambari Infra Solr Plugin ........................... SUCCESS [  0.445 s]
> [INFO] Ambari Infra Manager ............................... SUCCESS [  8.802 s]
> [INFO] Ambari Infra Solr Assembly ......................... SUCCESS [  0.214 s]
> [INFO] ------------------------------------------------------------------------
> [INFO] BUILD SUCCESS
> [INFO] ------------------------------------------------------------------------
> [INFO] Total time: 10:47 min
> [INFO] Finished at: 2017-11-20T13:48:32-08:00
> [INFO] Final Memory: 411M/1854M
> [INFO] ------------------------------------------------------------------------
> 
> Create a new service config version and corresponding configurations - EG : Initial configurations for HDFS
> ===========================================================================================================
> POST http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/servicegroups/test-hdp/services/HDFS/configurations/service_config_versions
> Request :
> ```json
> {
> 	"ServiceConfigVersion": {
> 		"service_config_version_note": "Initial configurations for HDFS",
> 		"stack_id": "HDP-3.0.0"
> 	},
> 	"configurations": [{
> 			"Config": {
> 				"type": "core-site",
> 				"tag": "version1",
> 				"properties": {
> 					"hadoop.proxyuser.hdfs.groups": "*",
> 					"hadoop.proxyuser.root.groups": "*",
> 					"hadoop.proxyuser.hdfs.hosts": "*",
> 					"hadoop.proxyuser.root.hosts": "mradha-1.openstacklocal",
> 					"fs.defaultFS": "hdfs://mradha-1.openstacklocal:8020",
> 					"fs.trash.interval": "360",
> 					"net.topology.script.file.name": "/etc/hadoop/conf/topology_script.py"
> 				},
> 				"service_config_version_note": "Initial configurations for HDFS",
> 				"properties_attributes": {
> 					"final": {
> 						"fs.defaultFS": "true"
> 					},
> 					"password": {},
> 					"user": {},
> 					"group": {},
> 					"text": {},
> 					"additional_user_property": {},
> 					"not_managed_hdfs_path": {},
> 					"value_from_property_file": {}
> 				}
> 			}
> 		},
> 
> 		{
> 			"Config": {
> 				"type": "hadoop-env",
> 				"tag": "version1",
> 				"properties": {
> 					"content": "abdef",
> 					"dtnode_heapsize": "1024m",
> 					"nfsgateway_heapsize": "1024",
> 					"hdfs_user": "hdfs",
> 					"proxyuser_group": "users"
> 				}
> 			}
> 		},
> 		{
> 			"Config": {
> 				"type": "hadoop-metrics2.properties",
> 				"tag": "version1",
> 				"properties": {
> 					"content": "abcdde"
> 				}
> 			}
> 		},
> 		{
> 			"Config": {
> 				"type": "hadoop-policy",
> 				"tag": "version1",
> 				"properties": {
> 					"security.admin.operations.protocol.acl": "hadoop",
> 					"security.client.datanode.protocol.acl": "*",
> 					"security.client.protocol.acl": "*",
> 					"security.datanode.protocol.acl": "*",
> 					"security.inter.datanode.protocol.acl": "*",
> 					"security.refresh.usertogroups.mappings.protocol.acl": "hadoop"
> 				}
> 			}
> 		},
> 		{
> 			"Config": {
> 				"type": "hdfs-log4j",
> 				"tag": "version1",
> 				"properties": {
> 					"content": "xyzedfg",
> 					"hadoop_log_max_backup_size": "256",
> 					"hadoop_log_number_of_backup_files": "10",
> 					"hadoop_security_log_max_backup_size": "256",
> 					"hadoop_security_log_number_of_backup_files": "20"
> 				}
> 			}
> 		},
> 
> 		{
> 			"Config": {
> 				"type": "hdfs-logsearch-conf",
> 				"tag": "version1",
> 				"properties": {
> 					"component_mappings": "NAMENODE:hdfs_namenode;DATANODE:hdfs_datanode;SECONDARY_NAMENODE:hdfs_secondarynamenode;JOURNALNODE:hdfs_journalnode;ZKFC:hdfs_zkfc;NFS_GATEWAY:hdfs_nfs3",
> 					"content": "some content info",
> 					"service_name": "HDFS"
> 				}
> 			}
> 		},
> 		{
> 			"Config": {
> 				"type": "hdfs-site",
> 				"tag": "version1",
> 				"properties": {
> 					"dfs.block.access.token.enable": "true",
> 					"dfs.blockreport.initialDelay": "120",
> 					"dfs.blocksize": "134217728",
> 					"nfs.exports.allowed.hosts": "* rw",
> 					"nfs.file.dump.dir": "/tmp/.hdfs-nfs"
> 				},
> 				"properties_attributes": {
> 					"final": {
> 						"dfs.datanode.data.dir": "true",
> 						"dfs.datanode.failed.volumes.tolerated": "true",
> 						"dfs.namenode.http-address": "true",
> 						"dfs.namenode.name.dir": "true",
> 						"dfs.support.append": "true",
> 						"dfs.webhdfs.enabled": "true"
> 					},
> 					"password": {},
> 					"user": {},
> 					"group": {},
> 					"text": {},
> 					"additional_user_property": {},
> 					"not_managed_hdfs_path": {},
> 					"value_from_property_file": {}
> 				}
> 			}
> 		},
> 		{
> 			"Config": {
> 				"type": "ranger-hdfs-audit",
> 				"tag": "version1",
> 				"properties": {}
> 			}
> 		},
> 		{
> 			"Config": {
> 				"type": "ranger-hdfs-plugin-properties",
> 				"tag": "version1",
> 				"properties": {}
> 
> 			}
> 		},
> 
> 		{
> 			"Config": {
> 				"type": "ranger-hdfs-policymgr-ssl",
> 				"tag": "version1",
> 				"properties": {}
> 
> 			}
> 		},
> 
> 		{
> 			"Config": {
> 				"type": "ranger-hdfs-security",
> 				"tag": "version1",
> 				"properties": {}
> 			}
> 		},
> 
> 		{
> 			"Config": {
> 				"type": "ssl-client",
> 				"tag": "version1",
> 				"properties": {
> 					"ssl.client.keystore.location": "/etc/security/clientKeys/keystore.jks",
> 					"ssl.client.keystore.password": "bigdata",
> 					"ssl.client.keystore.type": "jks",
> 					"ssl.client.truststore.location": "/etc/security/clientKeys/all.jks",
> 					"ssl.client.truststore.password": "bigdata",
> 					"ssl.client.truststore.reload.interval": "10000",
> 					"ssl.client.truststore.type": "jks"
> 				}
> 			}
> 		},
> 
> 		{
> 			"Config": {
> 				"type": "ssl-server",
> 				"tag": "version1",
> 				"properties": {
> 					"ssl.server.keystore.keypassword": "bigdata",
> 					"ssl.server.keystore.location": "/etc/security/serverKeys/keystore.jks",
> 					"ssl.server.keystore.password": "bigdata",
> 					"ssl.server.keystore.type": "jks",
> 					"ssl.server.truststore.location": "/etc/security/serverKeys/all.jks",
> 					"ssl.server.truststore.password": "bigdata",
> 					"ssl.server.truststore.reload.interval": "10000",
> 					"ssl.server.truststore.type": "jks"
> 				}
> 			}
> 
> 		}
> 	]
> }
> ```
> Response :
> ```json
> {
>   "resources" : [
>     {
>       "href" : "http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/configurations/service_config_versions?service_name=HDFS&service_config_version=1",
>       "configurations" : [
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "core-site",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : {
>             "fs.defaultFS" : "hdfs://mradha-1.openstacklocal:8020",
>             "ha.failover-controller.active-standby-elector.zk.op.retries" : "120",
>             "hadoop.security.authentication" : "simple",
>             "ipc.server.tcpnodelay" : "true",
>            },
>           "configAttributes" : {
>             "final" : {
>               "fs.defaultFS" : "true"
>             }
>           },
>           "propertiesTypes" : { }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-env",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : {
>             "proxyuser_group" : "users",
>             "hadoop_heapsize" : "1024",
>             "hadoop_root_logger" : "INFO,RFA",
>             "dtnode_heapsize" : "1024m",
>             "namenode_backup_dir" : "/tmp/upgrades",
>             "namenode_opt_permsize" : "128m"
>           },
>           "configAttributes" : { },
>           "propertiesTypes" : {
>             "NOT_MANAGED_HDFS_PATH" : [
>               "hdfs_tmp_dir"
>             ],
>             "USER" : [
>               "hdfs_user"
>             ],
>             "KERBEROS_PRINCIPAL" : [
>               "hdfs_principal_name"
>             ],
>             "GROUP" : [
>               "proxyuser_group"
>             ]
>           }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-metrics2.properties",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : {
>             "content" : "some content info"
>           },
>           "configAttributes" : { },
>           "propertiesTypes" : { }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-policy",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : {
>             "security.inter.datanode.protocol.acl" : "*",
>             "security.refresh.usertogroups.mappings.protocol.acl" : "hadoop",
>             "security.client.datanode.protocol.acl" : "*",
>             "security.admin.operations.protocol.acl" : "hadoop",
>             "security.datanode.protocol.acl" : "*",
>             "security.inter.tracker.protocol.acl" : "*",
>             "security.job.client.protocol.acl" : "*",
>             "security.job.task.protocol.acl" : "*",
>             "security.client.protocol.acl" : "*",
>             "security.refresh.policy.protocol.acl" : "hadoop",
>             "security.namenode.protocol.acl" : "*"
>           },
>           "configAttributes" : { },
>           "propertiesTypes" : { }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-log4j",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : {
>             "hadoop_security_log_max_backup_size" : "256",
>             "hadoop_security_log_number_of_backup_files" : "20",
>             "hadoop_log_number_of_backup_files" : "10",
>             "content" : "some content info",
>             "hadoop_log_max_backup_size" : "256"
>           },
>           "configAttributes" : { },
>           "propertiesTypes" : { }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-logsearch-conf",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : {
>             "component_mappings" : "NAMENODE:hdfs_namenode;DATANODE:hdfs_datanode;SECONDARY_NAMENODE:hdfs_secondarynamenode;JOURNALNODE:hdfs_journalnode;ZKFC:hdfs_zkfc;NFS_GATEWAY:hdfs_nfs3",
>             "service_name" : "HDFS",
>             "content" : "somecontentinfo"
>           },
>           "configAttributes" : { },
>           "propertiesTypes" : { }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-site",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : {
>             "dfs.replication" : "3",
>             "dfs.namenode.audit.log.async" : "true",
>             "dfs.namenode.checkpoint.dir" : "/hadoop/hdfs/namesecondary",
>             "dfs.namenode.avoid.read.stale.datanode" : "true",
>             "dfs.namenode.checkpoint.period" : "21600",
>             "dfs.datanode.http.address" : "0.0.0.0:50075"
>           },
>           "configAttributes" : {
>             "final" : {
>               "dfs.webhdfs.enabled" : "true",
>               "dfs.support.append" : "true",
>               "dfs.namenode.http-address" : "true",
>               "dfs.namenode.name.dir" : "true",
>               "dfs.datanode.failed.volumes.tolerated" : "true",
>               "dfs.datanode.data.dir" : "true"
>             }
>           },
>           "propertiesTypes" : { }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-audit",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : { },
>           "configAttributes" : { },
>           "propertiesTypes" : { }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-plugin-properties",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : { },
>           "configAttributes" : { },
>           "propertiesTypes" : {
>             "PASSWORD" : [
>               "REPOSITORY_CONFIG_PASSWORD"
>             ]
>           }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-policymgr-ssl",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : { },
>           "configAttributes" : { },
>           "propertiesTypes" : {
>             "PASSWORD" : [
>               "xasecure.policymgr.clientssl.truststore.password",
>               "xasecure.policymgr.clientssl.keystore.password"
>             ]
>           }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-security",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : { },
>           "configAttributes" : { },
>           "propertiesTypes" : { }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "ssl-client",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : {
>             "ssl.client.truststore.reload.interval" : "10000",
>             "ssl.client.keystore.location" : "/etc/security/clientKeys/keystore.jks",
>             "ssl.client.truststore.password" : "SECRET:ssl-client:1:ssl.client.truststore.password",
>             "ssl.client.truststore.type" : "jks",
>             "ssl.client.truststore.location" : "/etc/security/clientKeys/all.jks",
>             "ssl.client.keystore.password" : "SECRET:ssl-client:1:ssl.client.keystore.password",
>             "ssl.client.keystore.type" : "jks"
>           },
>           "configAttributes" : { },
>           "propertiesTypes" : {
>             "PASSWORD" : [
>               "ssl.client.truststore.password",
>               "ssl.client.keystore.password"
>             ]
>           }
>         },
>         {
>           "clusterName" : "cl1",
>           "stackId" : {
>             "stackName" : "HDP",
>             "stackVersion" : "3.0.0",
>             "stackId" : "HDP-3.0.0"
>           },
>           "type" : "ssl-server",
>           "versionTag" : "version1",
>           "version" : 1,
>           "serviceId" : 2,
>           "serviceGroupId" : 2,
>           "serviceConfigVersions" : null,
>           "configs" : {
>             "ssl.server.truststore.type" : "jks",
>             "ssl.server.truststore.password" : "SECRET:ssl-server:1:ssl.server.truststore.password",
>             "ssl.server.keystore.keypassword" : "SECRET:ssl-server:1:ssl.server.keystore.keypassword",
>             "ssl.server.truststore.reload.interval" : "10000",
>             "ssl.server.truststore.location" : "/etc/security/serverKeys/all.jks",
>             "ssl.server.keystore.type" : "jks",
>             "ssl.server.keystore.location" : "/etc/security/serverKeys/keystore.jks",
>             "ssl.server.keystore.password" : "SECRET:ssl-server:1:ssl.server.keystore.password"
>           },
>           "configAttributes" : { },
>           "propertiesTypes" : {
>             "PASSWORD" : [
>               "ssl.server.truststore.password",
>               "ssl.server.keystore.keypassword",
>               "ssl.server.keystore.password"
>             ]
>           }
>         }
>       ],
>       "group_id" : -1,
>       "group_name" : "Default",
>       "service_config_version" : 1,
>       "service_group_id" : 2,
>       "service_group_name" : "test-hdp",
>       "service_id" : 2,
>       "service_name" : "HDFS",
>       "ServiceConfigVersion" : {
>         "service_config_version_note" : "Initial configurations for HDFS"
>       }
>     }
>   ]
> }
> ```
> Change a particular config. EG: Change HDFS log4j maxnumber of backup files
> ============================================================================
> POST http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/servicegroups/test-hdp/services/HDFS/configurations/service_config_versions
> Request :
> ```json
>  {
> 	"ServiceConfigVersion": {
> 		"service_config_version_note": "HDFS number of log backup files from 10 to 12",
> 		"stack_id": "HDP-3.0.0"
> 	},
> 	"configurations": [{
> 			"Config": {
> 				"type": "hdfs-log4j",
> 				"tag": "version2",
> 				"properties": {
> 					"content": "somecontent",
> 					"hadoop_log_max_backup_size": "256",
> 					"hadoop_log_number_of_backup_files": "12",
> 					"hadoop_security_log_max_backup_size": "256",
> 					"hadoop_security_log_number_of_backup_files": "20"
> 				}
> 			}
> 		}
> 	]
> }
> ```
> 
> Revert back to an old config version. EG: Initial config version
> ==================================================================
> POST http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/servicegroups/test-hdp/services/HDFS/configurations/service_config_versions
> Request :
> ```json
> {
> "service_config_version": 1
> }
> ```
> 
> Fetch all the service config versions for a service. EG: HDFS
> ==================================================================
> GET http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/servicegroups/test-hdp/services/HDFS/configurations/service_config_versions
> Response :
> ```json
> {
>   "href" : "http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/servicegroups/test-hdp/services/HDFS/configurations/service_config_versions",
>   "items" : [
>     {
>       "href" : "http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/configurations/service_config_versions?service_name=HDFS&service_config_version=1",
>       "cluster_name" : "cl1",
>       "configurations" : [
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "core-site",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "fs.defaultFS" : "hdfs://mradha-1.openstacklocal:8020",
>             "fs.trash.interval" : "360",
>              "ipc.client.connection.maxidletime" : "30000",
>             "ipc.client.idlethreshold" : "8000",
>             "ipc.server.tcpnodelay" : "true",
>             "mapreduce.jobtracker.webinterface.trusted" : "false",
>             "net.topology.script.file.name" : "/etc/hadoop/conf/topology_script.py"
>           },
>           "properties_attributes" : {
>             "final" : {
>               "fs.defaultFS" : "true"
>             }
>           }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-env",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "content" : "some content",
>             "dtnode_heapsize" : "1024m",
>             "hadoop_heapsize" : "1024",
>             "namenode_opt_maxnewsize" : "128m",
>             "namenode_opt_maxpermsize" : "256m",
>             "namenode_opt_newsize" : "128m",
>             "namenode_opt_permsize" : "128m",
>             "nfsgateway_heapsize" : "1024",
>             "proxyuser_group" : "users"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-metrics2.properties",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "content" : "some content"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-policy",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "security.admin.operations.protocol.acl" : "hadoop",
>             "security.client.datanode.protocol.acl" : "*",
>              "security.namenode.protocol.acl" : "*",
>             "security.refresh.policy.protocol.acl" : "hadoop",
>             "security.refresh.usertogroups.mappings.protocol.acl" : "hadoop"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-log4j",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "content" : "some content",
>             "hadoop_log_max_backup_size" : "256",
>             "hadoop_log_number_of_backup_files" : "10",
>             "hadoop_security_log_max_backup_size" : "256",
>             "hadoop_security_log_number_of_backup_files" : "20"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-logsearch-conf",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "component_mappings" : "NAMENODE:hdfs_namenode;DATANODE:hdfs_datanode;SECONDARY_NAMENODE:hdfs_secondarynamenode;JOURNALNODE:hdfs_journalnode;ZKFC:hdfs_zkfc;NFS_GATEWAY:hdfs_nfs3",
>             "content" : "some content",
>             "service_name" : "HDFS"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-site",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "dfs.block.access.token.enable" : "true",
>             "dfs.blockreport.initialDelay" : "120",
>             "dfs.blocksize" : "134217728",
>             "dfs.permissions.enabled" : "true",
>             "dfs.permissions.superusergroup" : "hdfs",
>             "dfs.replication" : "3",
>               "nfs.file.dump.dir" : "/tmp/.hdfs-nfs"
>           },
>           "properties_attributes" : {
>             "final" : {
>               "dfs.webhdfs.enabled" : "true",
>               "dfs.support.append" : "true",
>               "dfs.namenode.http-address" : "true",
>               "dfs.namenode.name.dir" : "true",
>               "dfs.datanode.failed.volumes.tolerated" : "true",
>               "dfs.datanode.data.dir" : "true"
>             }
>           }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-audit",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-plugin-properties",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-policymgr-ssl",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-security",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ssl-client",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "ssl.client.keystore.location" : "/etc/security/clientKeys/keystore.jks",
>             "ssl.client.keystore.password" : "SECRET:ssl-client:1:ssl.client.keystore.password",
>             "ssl.client.truststore.reload.interval" : "10000",
>             "ssl.client.truststore.type" : "jks"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ssl-server",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "ssl.server.keystore.keypassword" : "SECRET:ssl-server:1:ssl.server.keystore.keypassword",
>             "ssl.server.keystore.location" : "/etc/security/serverKeys/keystore.jks",
>             "ssl.server.keystore.password" : "SECRET:ssl-server:1:ssl.server.keystore.password",
>             "ssl.server.keystore.type" : "jks",
>             "ssl.server.truststore.location" : "/etc/security/serverKeys/all.jks",
>             "ssl.server.truststore.password" : "SECRET:ssl-server:1:ssl.server.truststore.password",
>             "ssl.server.truststore.reload.interval" : "10000",
>             "ssl.server.truststore.type" : "jks"
>           },
>           "properties_attributes" : { }
>         }
>       ],
>       "createtime" : 1510956751144,
>       "group_id" : -1,
>       "group_name" : "Default",
>       "hosts" : [ ],
>       "is_cluster_compatible" : true,
>       "is_current" : false,
>       "service_config_version" : 1,
>       "service_group_name" : "test-hdp",
>       "service_name" : "HDFS",
>       "user" : "admin",
>       "ServiceConfigVersion" : {
>         "service_config_version_note" : "Initial configurations for HDFS",
>         "stack_id" : "HDP-3.0.0"
>       }
>     },
>     {
>       "href" : "http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/configurations/service_config_versions?service_name=HDFS&service_config_version=2",
>       "cluster_name" : "cl1",
>       "configurations" : [
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "core-site",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "fs.defaultFS" : "hdfs://mradha-1.openstacklocal:8020",
>             "fs.trash.interval" : "360",
>             "ha.failover-controller.active-standby-elector.zk.op.retries" : "120",
>              "ipc.server.tcpnodelay" : "true",
>             "mapreduce.jobtracker.webinterface.trusted" : "false",
>             "net.topology.script.file.name" : "/etc/hadoop/conf/topology_script.py"
>           },
>           "properties_attributes" : {
>             "final" : {
>               "fs.defaultFS" : "true"
>             }
>           }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-env",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "content" : "some content",
>             "dtnode_heapsize" : "1024m",
>             "hadoop_heapsize" : "1024",
>             "hadoop_pid_dir_prefix" : "/var/run/hadoop",
>             "namenode_opt_newsize" : "128m",
>             "namenode_opt_permsize" : "128m",
>             "nfsgateway_heapsize" : "1024",
>             "proxyuser_group" : "users"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-metrics2.properties",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "content" : "some content"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-policy",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "security.admin.operations.protocol.acl" : "hadoop",
>             "security.client.datanode.protocol.acl" : "*",
>             "security.job.task.protocol.acl" : "*",
>             "security.namenode.protocol.acl" : "*",
>             "security.refresh.policy.protocol.acl" : "hadoop",
>             "security.refresh.usertogroups.mappings.protocol.acl" : "hadoop"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-logsearch-conf",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "component_mappings" : "NAMENODE:hdfs_namenode;DATANODE:hdfs_datanode;SECONDARY_NAMENODE:hdfs_secondarynamenode;JOURNALNODE:hdfs_journalnode;ZKFC:hdfs_zkfc;NFS_GATEWAY:hdfs_nfs3",
>             "content" : "some content",
>             "service_name" : "HDFS"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-site",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "dfs.block.access.token.enable" : "true",
>             "dfs.blockreport.initialDelay" : "120",
>             "dfs.blocksize" : "134217728",
>             "dfs.datanode.http.address" : "0.0.0.0:50075",
>             "hadoop.caller.context.enabled" : "true",
>             "nfs.exports.allowed.hosts" : "* rw",
>             "nfs.file.dump.dir" : "/tmp/.hdfs-nfs"
>           },
>           "properties_attributes" : {
>             "final" : {
>               "dfs.webhdfs.enabled" : "true",
>               "dfs.support.append" : "true",
>               "dfs.namenode.http-address" : "true",
>               "dfs.namenode.name.dir" : "true",
>               "dfs.datanode.failed.volumes.tolerated" : "true",
>               "dfs.datanode.data.dir" : "true"
>             }
>           }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-audit",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-plugin-properties",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-policymgr-ssl",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-security",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ssl-client",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "ssl.client.keystore.location" : "/etc/security/clientKeys/keystore.jks",
>             "ssl.client.keystore.password" : "SECRET:ssl-client:1:ssl.client.keystore.password",
>             "ssl.client.keystore.type" : "jks",
>             "ssl.client.truststore.location" : "/etc/security/clientKeys/all.jks",
>             "ssl.client.truststore.password" : "SECRET:ssl-client:1:ssl.client.truststore.password",
>             "ssl.client.truststore.reload.interval" : "10000",
>             "ssl.client.truststore.type" : "jks"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ssl-server",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "ssl.server.keystore.keypassword" : "SECRET:ssl-server:1:ssl.server.keystore.keypassword",
>             "ssl.server.keystore.location" : "/etc/security/serverKeys/keystore.jks",
>             "ssl.server.truststore.type" : "jks"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-log4j",
>           "tag" : "version2",
>           "version" : 2,
>           "properties" : {
>             "content" : "some content",
>             "hadoop_log_max_backup_size" : "256",
>             "hadoop_log_number_of_backup_files" : "12",
>             "hadoop_security_log_max_backup_size" : "256",
>             "hadoop_security_log_number_of_backup_files" : "20"
>           },
>           "properties_attributes" : { }
>         }
>       ],
>       "createtime" : 1510958422471,
>       "group_id" : -1,
>       "group_name" : "Default",
>       "hosts" : [ ],
>       "is_cluster_compatible" : true,
>       "is_current" : false,
>       "service_config_version" : 2,
>       "service_group_name" : "test-hdp",
>       "service_name" : "HDFS",
>       "user" : "admin",
>       "ServiceConfigVersion" : {
>         "service_config_version_note" : "HDFS number of log backup files from 10 to 12",
>         "stack_id" : "HDP-3.0.0"
>       }
>     },
>     {
>       "href" : "http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/configurations/service_config_versions?service_name=HDFS&service_config_version=3",
>       "cluster_name" : "cl1",
>       "configurations" : [
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "core-site",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "fs.defaultFS" : "hdfs://mradha-1.openstacklocal:8020",
>             "fs.trash.interval" : "360",
>           },
>           "properties_attributes" : {
>             "final" : {
>               "fs.defaultFS" : "true"
>             }
>           }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-env",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "content" : "some content",
>             "dtnode_heapsize" : "1024m",
>             "keyserver_host" : " ",
>             "keyserver_port" : "",
>             "namenode_backup_dir" : "/tmp/upgrades",
>              "proxyuser_group" : "users"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-metrics2.properties",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "content" : "some content"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-policy",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "security.admin.operations.protocol.acl" : "hadoop",
>             "security.job.client.protocol.acl" : "*",
>             "security.job.task.protocol.acl" : "*",
>             "security.namenode.protocol.acl" : "*",
>             "security.refresh.policy.protocol.acl" : "hadoop",
>             "security.refresh.usertogroups.mappings.protocol.acl" : "hadoop"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-log4j",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "content" : "some content",
>             "hadoop_log_max_backup_size" : "256",
>             "hadoop_log_number_of_backup_files" : "10",
>             "hadoop_security_log_max_backup_size" : "256",
>             "hadoop_security_log_number_of_backup_files" : "20"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-logsearch-conf",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "component_mappings" : "NAMENODE:hdfs_namenode;DATANODE:hdfs_datanode;SECONDARY_NAMENODE:hdfs_secondarynamenode;JOURNALNODE:hdfs_journalnode;ZKFC:hdfs_zkfc;NFS_GATEWAY:hdfs_nfs3",
>             "content" : "soemcontent",
>             "service_name" : "HDFS"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-site",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "dfs.block.access.token.enable" : "true",
>             "dfs.blockreport.initialDelay" : "120",
>             "dfs.blocksize" : "134217728",
>             "nfs.exports.allowed.hosts" : "* rw",
>             "nfs.file.dump.dir" : "/tmp/.hdfs-nfs"
>           },
>           "properties_attributes" : {
>             "final" : {
>               "dfs.webhdfs.enabled" : "true",
>               "dfs.support.append" : "true",
>               "dfs.namenode.http-address" : "true",
>               "dfs.namenode.name.dir" : "true",
>               "dfs.datanode.failed.volumes.tolerated" : "true",
>               "dfs.datanode.data.dir" : "true"
>             }
>           }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-audit",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-plugin-properties",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-policymgr-ssl",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-security",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ssl-client",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "ssl.client.keystore.location" : "/etc/security/clientKeys/keystore.jks",
>             "ssl.client.keystore.password" : "SECRET:ssl-client:1:ssl.client.keystore.password",
>             "ssl.client.keystore.type" : "jks",
>             "ssl.client.truststore.location" : "/etc/security/clientKeys/all.jks",
>             "ssl.client.truststore.password" : "SECRET:ssl-client:1:ssl.client.truststore.password",
>             "ssl.client.truststore.reload.interval" : "10000",
>             "ssl.client.truststore.type" : "jks"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ssl-server",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "ssl.server.keystore.keypassword" : "SECRET:ssl-server:1:ssl.server.keystore.keypassword",
>             "ssl.server.keystore.location" : "/etc/security/serverKeys/keystore.jks",
>           },
>           "properties_attributes" : { }
>         }
>       ],
>       "createtime" : 1510962642204,
>       "group_id" : -1,
>       "group_name" : "Default",
>       "hosts" : [ ],
>       "is_cluster_compatible" : true,
>       "is_current" : true,
>       "service_config_version" : 3,
>       "service_group_name" : "test-hdp",
>       "service_name" : "HDFS",
>       "user" : "admin",
>       "ServiceConfigVersion" : {
>         "service_config_version_note" : null,
>         "stack_id" : "HDP-3.0.0"
>       }
>     }
>   ]
> }
> ```
> Fetch the latest config version for a service. EG: HDFS
> ========================================================
> GET http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/servicegroups/test-hdp/services/HDFS/configurations/service_config_versions?is_current=true
> Response :
> ```json
> {
>   "href" : "http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/servicegroups/test-hdp/services/HDFS/configurations/service_config_versions?is_current=true",
>   "items" : [
>     {
>       "href" : "http://c6401.ambari.apache.org:8080/api/v1/clusters/cl1/configurations/service_config_versions?service_name=HDFS&service_config_version=3",
>       "cluster_name" : "cl1",
>       "configurations" : [
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "core-site",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "fs.defaultFS" : "hdfs://mradha-1.openstacklocal:8020",
>             "fs.trash.interval" : "360",
>             "ha.failover-controller.active-standby-elector.zk.op.retries" : "120",
>             "ipc.server.tcpnodelay" : "true",
>             "mapreduce.jobtracker.webinterface.trusted" : "false",
>             "net.topology.script.file.name" : "/etc/hadoop/conf/topology_script.py"
>           },
>           "properties_attributes" : {
>             "final" : {
>               "fs.defaultFS" : "true"
>             }
>           }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-env",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "content" : "some content",
>             "dtnode_heapsize" : "1024m",
>             "namenode_opt_newsize" : "128m",
>             "namenode_opt_permsize" : "128m",
>             "nfsgateway_heapsize" : "1024",
>             "proxyuser_group" : "users"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-metrics2.properties",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "content" : "some content"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hadoop-policy",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "security.admin.operations.protocol.acl" : "hadoop",
>             "security.client.datanode.protocol.acl" : "*",
>             "security.client.protocol.acl" : "*",
>             "security.refresh.policy.protocol.acl" : "hadoop",
>             "security.refresh.usertogroups.mappings.protocol.acl" : "hadoop"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-log4j",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "content" : "some content",
>             "hadoop_log_max_backup_size" : "256",
>             "hadoop_log_number_of_backup_files" : "10",
>             "hadoop_security_log_max_backup_size" : "256",
>             "hadoop_security_log_number_of_backup_files" : "20"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-logsearch-conf",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "component_mappings" : "NAMENODE:hdfs_namenode;DATANODE:hdfs_datanode;SECONDARY_NAMENODE:hdfs_secondarynamenode;JOURNALNODE:hdfs_journalnode;ZKFC:hdfs_zkfc;NFS_GATEWAY:hdfs_nfs3",
>             "content" : "some content",
>             "service_name" : "HDFS"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "hdfs-site",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "dfs.block.access.token.enable" : "true",
>             "dfs.blockreport.initialDelay" : "120",
>             "dfs.blocksize" : "134217728",
>             "dfs.client.read.shortcircuit" : "true",
>             "dfs.namenode.safemode.threshold-pct" : "1",
>             "dfs.namenode.secondary.http-address" : "mradha-2.openstacklocal:50090",
>             "dfs.namenode.stale.datanode.interval" : "30000",
>          
>             "nfs.file.dump.dir" : "/tmp/.hdfs-nfs"
>           },
>           "properties_attributes" : {
>             "final" : {
>               "dfs.webhdfs.enabled" : "true",
>               "dfs.support.append" : "true",
>               "dfs.namenode.http-address" : "true",
>               "dfs.namenode.name.dir" : "true",
>               "dfs.datanode.failed.volumes.tolerated" : "true",
>               "dfs.datanode.data.dir" : "true"
>             }
>           }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-audit",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-plugin-properties",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-policymgr-ssl",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ranger-hdfs-security",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : { },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ssl-client",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "ssl.client.keystore.location" : "/etc/security/clientKeys/keystore.jks",
>             "ssl.client.keystore.password" : "SECRET:ssl-client:1:ssl.client.keystore.password",
>             "ssl.client.keystore.type" : "jks",
>             "ssl.client.truststore.location" : "/etc/security/clientKeys/all.jks",
>             "ssl.client.truststore.password" : "SECRET:ssl-client:1:ssl.client.truststore.password",
>             "ssl.client.truststore.reload.interval" : "10000",
>             "ssl.client.truststore.type" : "jks"
>           },
>           "properties_attributes" : { }
>         },
>         {
>           "Config" : {
>             "cluster_name" : "cl1",
>             "stack_id" : "HDP-3.0.0"
>           },
>           "type" : "ssl-server",
>           "tag" : "version1",
>           "version" : 1,
>           "properties" : {
>             "ssl.server.keystore.keypassword" : "SECRET:ssl-server:1:ssl.server.keystore.keypassword",
>             "ssl.server.keystore.location" : "/etc/security/serverKeys/keystore.jks",
>             "ssl.server.keystore.password" : "SECRET:ssl-server:1:ssl.server.keystore.password",
>             "ssl.server.keystore.type" : "jks",
>             "ssl.server.truststore.location" : "/etc/security/serverKeys/all.jks",
>             "ssl.server.truststore.password" : "SECRET:ssl-server:1:ssl.server.truststore.password",
>             "ssl.server.truststore.reload.interval" : "10000",
>             "ssl.server.truststore.type" : "jks"
>           },
>           "properties_attributes" : { }
>         }
>       ],
>       "createtime" : 1510962642204,
>       "group_id" : -1,
>       "group_name" : "Default",
>       "hosts" : [ ],
>       "is_cluster_compatible" : true,
>       "is_current" : true,
>       "service_config_version" : 3,
>       "service_group_name" : "test-hdp",
>       "service_name" : "HDFS",
>       "user" : "admin",
>       "ServiceConfigVersion" : {
>         "service_config_version_note" : null,
>         "stack_id" : "HDP-3.0.0"
>       }
>     }
>   ]
> }
> ```
> 
> Trimmed down some config properties to reduce size.
> 
> 
> Thanks,
> 
> Madhuvanthi Radhakrishnan
> 
>