• MapReduce Service

mrs
  1. Help Center
  2. MapReduce Service
  3. User Guide
  4. MRS Manager Operation Guide
  5. Object Management
  6. Introduction

Introduction

An MRS cluster contains different types of basic objects. Table 1 describes these objects.

Table 1 MRS basic objects

Object

Description

Example

Service

Function set that can complete specific operations.

KrbServer service and LdapServer service

Service instance

Specific instance of a service, often referred to as a service.

KrbServer service

Service role

Functional entity that forms a complete service, often referred to as a role.

KrbServer consists of the KerberosAdmin role and the KerberosServer role.

Role instance

Specific instance of a service role running on a host.

KerberosAdmin running on Host2 and KerberosServer running on Host3

Host

Elastic Cloud Server (ECS) running a Linux OS.

Host1 to Host5

Rack

Physical entity that contains multiple hosts connecting to the same switch.

Rack1 contains Host1 to Host5.

Cluster

Logical entity that consists of multiple hosts and provides various services.

Cluster1 consists of five hosts (Host1 to Host5) and provides services such as KrbServer and LdapServer.