推荐的群集主机和角色分配
要点：本主题描述了Cloudera Manager管理的CDH群集的建议角色分配。您为部署选择的实际分配可能会有所不同，具体取决于工作负载的类型和数量，群集中部署的服务，硬件资源，配置和其他因素。
使用Cloudera Manager安装向导安装CDH时，Cloudera Manager会尝试根据主机中可用的资源在群集主机（分配给网关主机的角色除外）之间分配角色。您可以在向导中显示的“ 自定义角色分配”页面上更改这些分配。您也可以稍后使用Cloudera Manager更改和添加角色。请参阅角色实例。
如果您的群集使用静态数据加密，请参阅为密钥受托者服务器和密钥受托者KMS分配主机。
有关在何处找到Cloudera Manager和其他服务所需的各种数据库的信息，请参阅步骤4：安装和配置数据库。
CDH群集主机和角色分配
群集主机可以大致描述为以下类型：
- 主主机运行Hadoop主进程，例如HDFS NameNode和YARN Resource Manager。
- 实用程序主机运行不是主进程的其他集群进程，例如Cloudera Manager和Hive Metastore。
- 网关主机是用于在群集中启动作业的客户端访问点。所需的网关主机数量取决于工作负载的类型和大小。
- 工作者主机主要运行DataNode和其他分布式进程，例如Impalad。
重要提示： Cloudera建议您在生产环境中使用CDH时始终启用高可用性。
下表描述了针对不同群集大小的建议角色分配：
3 - 10 Worker Hosts without High Availability
| Master Hosts | Utility Hosts | Gateway Hosts | Worker Hosts |
|---|---|---|---|
Master Host 1:
|
One host for all Utility and Gateway roles:
|
3 - 10 Worker Hosts:
|
|
3 - 20 Worker Hosts with High Availability
| Master Hosts | Utility Hosts | Gateway Hosts | Worker Hosts |
|---|---|---|---|
|
Master Host 1:
Master Host 2:
Master Host 3:
|
Utility Host 1:
|
One or more Gateway Hosts:
|
3 - 20 Worker Hosts:
|
20 - 80 Worker Hosts with High Availability
| Master Hosts | Utility Hosts | Gateway Hosts | Worker Hosts |
|---|---|---|---|
|
Master Host 1:
Master Host 2:
Master Host 3:
|
Utility Host 1:
Utility Host 2:
|
One or more Gateway Hosts:
|
20 - 80 Worker Hosts:
|
80 - 200 Worker Hosts with High Availability
| Master Hosts | Utility Hosts | Gateway Hosts | Worker Hosts |
|---|---|---|---|
|
Master Host 1:
Master Host 2:
Master Host 3:
|
Utility Host 1:
Utility Host 2:
Utility Host 3:
Utility Host 4:
Utility Host 5:
Utility Host 6:
Utility Host 7:
Utility Host 8:
|
One or more Gateway Hosts:
|
80 - 200 Worker Hosts:
|
200 - 500 Worker Hosts with High Availability
| Master Hosts | Utility Hosts | Gateway Hosts | Worker Hosts |
|---|---|---|---|
|
Master Host 1:
Master Host 2:
Master Host 3:
Master Host 4:
Master Host 5:
We recommend no more than three Kudu masters. |
Utility Host 1:
Utility Host 2:
Utility Host 3:
Utility Host 4:
Utility Host 5:
Utility Host 6:
Utility Host 7:
Utility Host 8:
|
One or more Gateway Hosts:
|
200 - 500 Worker Hosts:
|
500 -1000 Worker Hosts with High Availability
|
Master Hosts
|
Utility Hosts | Gateway Hosts | Worker Hosts |
|---|---|---|---|
|
Master Host 1:
Master Host 2:
Master Host 3:
Master Host 4:
Master Host 5:
We recommend no more than three Kudu masters. |
Utility Host 1:
Utility Host 2:
Utility Host 3:
Utility Host 4:
Utility Host 5:
Utility Host 6:
Utility Host 7:
Utility Host 8:
|
One or more Gateway Hosts:
|
500 - 1000 Worker Hosts:
|
为密钥受托者服务器和密钥受托者KMS分配主机
如果要为CDH群集启用静态数据加密，Cloudera建议您通过在Cloudera Manager管理的单独群集中的专用主机上部署密钥受托者服务器，将密钥受托者服务器与其他企业数据中心（EDH）服务隔离开来。Cloudera还建议在与需要访问Key Trustee Server的EDH服务相同的群集中的专用主机上部署Key Trustee KMS。此体系结构允许多个群集共享相同的密钥托管服务器，并避免在重新启动群集时重新启动密钥托管服务器。
对于一般的生产环境，或者如果您已启用HDFS的高可用性并且正在使用静态数据加密，Cloudera建议您为密钥受托服务器和密钥受托者KMS启用高可用性。