通过API访问Ambari的配置

HttpClient client = new HttpClient();
Base64.Encoder encoder = Base64.getEncoder();
HttpMethod method = new GetMethod("http://hdp0:8080/api/v1/clusters/HDP/configurations");
method.addRequestHeader("Authorization",
        "Basic " + encoder.encodeToString("admin:admin".getBytes("iso-8859-1")));
method.addRequestHeader("X-Requested-By", "ambari");
client.executeMethod(method);

// 获取YARN的capacity-scheduler属性信息
AmbariClient aClient = new AmbariClient("10.1.108.45", "8080", "admin", "admin");
String typeName = "capacity-scheduler";
String propertieName = "yarn.scheduler.capacity.root.unfunded.capacity";
Map<String, Map<String, String>> map = aClient.getServiceConfigMap(typeName);
for (String key : map.keySet()) {
    System.out.println("key: " + key + ";");
    Map<String, String> kvs = map.get(key);
    for (String name : kvs.keySet()) {
        if (name.equals(propertieName)) {
            System.out.println("name: " + name + "; value: " + kvs.get(name));
        }
    }
}
// 修改配置信息
Map<String, String> mapUpdate = new HashMap<String, String>();

mapUpdate.put(propertieName, "55");
aClient.modifyConfiguration(typeName, mapUpdate);

map = aClient.getServiceConfigMap(typeName);
for (String key : map.keySet()) {
    System.out.println("key: " + key + ";");
    Map<String, String> kvs = map.get(key);
    for (String name : kvs.keySet()) {
        if (name.equals(propertieName)) {
            System.out.println("name: " + name + "; value: " + kvs.get(name));
        }
    }
}

 Ambari所有的服务的组件列表：

{"service_name":"HDFS","component_name":"DATANODE","hosts":"c6401.ambari.apache.org"},
{"service_name":"HDFS","component_name":"HDFS_CLIENT","hosts":"c6401.ambari.apache.org"},
{"service_name":"HDFS","component_name":"NAMENODE","hosts":"c6401.ambari.apache.org"},   
{"service_name":"HDFS","component_name":"SECONDARY_NAMENODE","hosts":"c6401.ambari.apache.org"},

{"service_name":"HIVE","component_name":"HCAT","hosts":"c6401.ambari.apache.org"},
{"service_name":"HIVE","component_name":"HIVE_CLIENT","hosts":"c6401.ambari.apache.org"},
{"service_name":"HIVE","component_name":"HIVE_METASTORE","hosts":"c6401.ambari.apache.org"},
{"service_name":"HIVE","component_name":"HIVE_SERVER","hosts":"c6401.ambari.apache.org"},
{"service_name":"HIVE","component_name":"MYSQL_SERVER","hosts":"c6401.ambari.apache.org"},
{"service_name":"HIVE","component_name":"WEBHCAT_SERVER","hosts":"c6401.ambari.apache.org"},

{"service_name":"YARN","component_name":"APP_TIMELINE_SERVER","hosts":"c6401.ambari.apache.org"},
{"service_name":"YARN","component_name":"NODEMANAGER","hosts":"c6401.ambari.apache.org"},
{"service_name":"YARN","component_name":"RESOURCEMANAGER","hosts":"c6401.ambari.apache.org"},
{"service_name":"YARN","component_name":"YARN_CLIENT","hosts":"c6401.ambari.apache.org"},

{"service_name":"MAPREDUCE2","component_name":"HISTORYSERVER","hosts":"c6401.ambari.apache.org"},
{"service_name":"MAPREDUCE2","component_name":"MAPREDUCE2_CLIENT","hosts":"c6401.ambari.apache.org"},
{"service_name":"AMBARI_METRICS","component_name":"METRICS_COLLECTOR","hosts":"c6401.ambari.apache.org"},
{"service_name":"AMBARI_METRICS","component_name":"METRICS_MONITOR","hosts":"c6401.ambari.apache.org"},

{"service_name":"PIG","component_name":"PIG","hosts":"c6401.ambari.apache.org"},

{"service_name":"TEZ","component_name":"TEZ_CLIENT","hosts":"c6401.ambari.apache.org"},

{"service_name":"ZOOKEEPER","component_name":"ZOOKEEPER_CLIENT","hosts":"c6401.ambari.apache.org"},
{"service_name":"ZOOKEEPER","component_name":"ZOOKEEPER_SERVER","hosts":"c6401.ambari.apache.org"}