1.4、CDH 搭建Hadoop在安装之前(推荐的群集主机和角色分配)

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。

继续阅读：

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: NameNode YARN ResourceManager JobHistory Server ZooKeeper Kudu master Spark History Server	One host for all Utility and Gateway roles: Secondary NameNode Cloudera Manager Cloudera Manager Management Service Hive Metastore HiveServer2 Impala Catalog Server Impala StateStore Hue Oozie Flume Gateway configuration		3 - 10 Worker Hosts: DataNode NodeManager Impalad Kudu tablet server

3 - 20 Worker Hosts with High Availability

Master Hosts	Utility Hosts	Gateway Hosts	Worker Hosts
Master Host 1: NameNode JournalNode FailoverController YARN ResourceManager ZooKeeper JobHistory Server Spark History Server Kudu master Master Host 2: NameNode JournalNode FailoverController YARN ResourceManager ZooKeeper Kudu master Master Host 3: Kudu master (Kudu requires an odd number of masters for HA.)	Utility Host 1: Cloudera Manager Cloudera Manager Management Service Hive Metastore Impala Catalog Server Impala StateStore Oozie ZooKeeper (requires dedicated disk) JournalNode (requires dedicated disk)	One or more Gateway Hosts: Hue HiveServer2 Flume Gateway configuration	3 - 20 Worker Hosts: DataNode NodeManager Impalad Kudu tablet server

20 - 80 Worker Hosts with High Availability

Master Hosts	Utility Hosts	Gateway Hosts	Worker Hosts
Master Host 1: NameNode JournalNode FailoverController YARN ResourceManager ZooKeeper Kudu master Master Host 2: NameNode JournalNode FailoverController YARN ResourceManager ZooKeeper Kudu master Master Host 3: ZooKeeper JournalNode JobHistory Server Spark History Server Kudu master	Utility Host 1: Cloudera Manager Utility Host 2: Cloudera Manager Management Service Hive Metastore Impala Catalog Server Oozie	One or more Gateway Hosts: Hue HiveServer2 Flume Gateway configuration	20 - 80 Worker Hosts: DataNode NodeManager Impalad Kudu tablet server

80 - 200 Worker Hosts with High Availability

Master Hosts	Utility Hosts	Gateway Hosts	Worker Hosts
Master Host 1: NameNode JournalNode FailoverController YARN ResourceManager ZooKeeper Kudu master Master Host 2: NameNode JournalNode FailoverController YARN ResourceManager ZooKeeper Kudu master Master Host 3: ZooKeeper JournalNode JobHistory Server Spark History Server Kudu master	Utility Host 1: Cloudera Manager Utility Host 2: Hive Metastore Impala Catalog Server Impala StateStore Oozie Utility Host 3: Activity Monitor Utility Host 4: Host Monitor Utility Host 5: Navigator Audit Server Utility Host 6: Navigator Metadata Server Utility Host 7: Reports Manager Utility Host 8: Service Monitor	One or more Gateway Hosts: Hue HiveServer2 Flume Gateway configuration	80 - 200 Worker Hosts: DataNode NodeManager Impalad Kudu tablet server (Recommended maximum number of tablet servers is 100.)

200 - 500 Worker Hosts with High Availability

Master Hosts	Utility Hosts	Gateway Hosts	Worker Hosts
Master Host 1: NameNode JournalNode FailoverController ZooKeeper Kudu master Master Host 2: NameNode JournalNode FailoverController ZooKeeper Kudu master Master Host 3: YARN ResourceManager ZooKeeper JournalNode Kudu master Master Host 4: YARN ResourceManager ZooKeeper JournalNode Master Host 5: JobHistory Server Spark History Server ZooKeeper JournalNode We recommend no more than three Kudu masters.	Utility Host 1: Cloudera Manager Utility Host 2: Hive Metastore Impala Catalog Server Impala StateStore Oozie Utility Host 3: Activity Monitor Utility Host 4: Host Monitor Utility Host 5: Navigator Audit Server Utility Host 6: Navigator Metadata Server Utility Host 7: Reports Manager Utility Host 8: Service Monitor	One or more Gateway Hosts: Hue HiveServer2 Flume Gateway configuration	200 - 500 Worker Hosts: DataNode NodeManager Impalad Kudu tablet server (Recommended maximum number of tablet servers is 100.)

500 -1000 Worker Hosts with High Availability

Master Hosts	Utility Hosts	Gateway Hosts	Worker Hosts
Master Host 1: NameNode JournalNode FailoverController ZooKeeper Kudu master Master Host 2: NameNode JournalNode FailoverController ZooKeeper Kudu master Master Host 3: YARN ResourceManager ZooKeeper JournalNode Kudu master Master Host 4: YARN ResourceManager ZooKeeper JournalNode Master Host 5: JobHistory Server Spark History Server ZooKeeper JournalNode We recommend no more than three Kudu masters.	Utility Host 1: Cloudera Manager Utility Host 2: Hive Metastore Impala Catalog Server Impala StateStore Oozie Utility Host 3: Activity Monitor Utility Host 4: Host Monitor Utility Host 5: Navigator Audit Server Utility Host 6: Navigator Metadata Server Utility Host 7: Reports Manager Utility Host 8: Service Monitor	One or more Gateway Hosts: Hue HiveServer2 Flume Gateway configuration	500 - 1000 Worker Hosts: DataNode NodeManager Impalad Kudu tablet server (Recommended maximum number of tablet servers is 100.)

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。

有关在EDH中加密静态数据的详细信息，请参阅加密静态数据。

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。

看到：