Question

我有一个HDP集群＆amp;有java客户端需要在运行时下载配置文件（hdfs-site.xml，core-site.xml，hbase-site）？我该如何实现这一目标？ Cloudera Manager提供了下载配置文件的URL方式，我们是否有与ambari类似的东西？

Answer 1

您可以使用Ambari API或命令行实用程序下载为任何配置文件设置的属性及其值。（但你可以用json格式下载而不是配置文件，因为它是xml格式。）

API：

步骤1：查找最新的配置版本

curl -u admin:admin -H "X-Requested-By: ambari" -X GET  http://<AMBARI_SERVER_HOST>:8080/api/v1/clusters/<CLUSTER_NAME>?fields=Clusters/desired_configs

Sample OUTPUT
{
  "href" : "http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME?fields=Clusters/desired_configs",
  "Clusters" : {
    "cluster_name" : "CLUSTER_NAME",
    "version" : "HDP-2.0.6",
    "desired_configs" : {
      ...
      "mapred-site" : {
        "user" : "admin",
        "tag" : "version1384716039631"
      }
      ...
    }
  }
}

第2步：下载配置

curl -u admin:admin -H "X-Requested-By: ambari" -X GET "http://<AMBARI_SERVER_HOST>:8080/api/v1/clusters/<CLUSTER_NAME>/configurations?type=mapred-site&tag=version1384716039631"

Sample OUTPUT
{
  "href" : "http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/configurations?type=mapred-site&tag=version1384716039631",
  "items" : [
    {
      "href" : "http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/configurations?type=mapred-site&tag=version1384716039631",
      "tag" : "version1384716039631",
      "type" : "mapred-site",
      "Config" : {
        "cluster_name" : "CLUSTER_NAME"
      },
      "properties" : {
      ... THESE ARE THE PROPERTY KEY-VALUE PAIRS ...
      }
    }]
}

使用命令行实用程序

/var/lib/ambari-server/resources/scripts/configs.sh get <ambari host> <cluster name> <config file type>

Example: /var/lib/ambari-server/resources/scripts/configs.sh get localhost Sandbox mapred-site

更多详情可参阅以下链接

https://cwiki.apache.org/confluence/display/AMBARI/Modify+configurations

Hortonworks如何以编程方式下载HBase配置文件？

1 个答案: