Elasticsearch 如何实现索引的伪·命名空间
环境说明
jdk8
elasticsearch7.4.0
springboot 2.3.12.RELEASE
spring-data-elasticsearch 4.0.9.RELEASE
注：本文不做特殊说明的情况下，client1与client2使用相同配置
应用场景
在公司内部资源紧张的情况下，多个项目使用同一个elasticsearch并且数据互不干扰，实现资源的最大化利用，节约成本
集成Elasticsearch
pom（client1与client2相同）
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.12.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-elasticsearch</artifactId>
<version>4.0.9.RELEASE</version>
</dependency>
</dependencies>
config（client1与client2相同）
@Configuration
public class RestClientConfig extends AbstractElasticsearchConfiguration {
@Bean
@Override
public RestHighLevelClient elasticsearchClient() {
final ClientConfiguration clientConfiguration = ClientConfiguration.builder()
.connectedTo("localhost:9200")
.build();
return RestClients.create(clientConfiguration).rest();
}
}
yml
client1
spring.data.elasticsearch.client.namespace=client1
server.port=8081
client2
spring.data.elasticsearch.client.namespace=client2
server.port=8082
索引名定义(client1与client2相同)
定义变量获取
@Configuration
public class EsConst {
@Value("${spring.data.elasticsearch.client.namespace}")
private String elasticsearchNamespace;
@Bean
public String getElasticsearchNamespace(){
return elasticsearchNamespace;
}
}
新建User 实体类，指定索引名称为namespace.user
@Document(indexName = "#{@getElasticsearchNamespace}.user")
public class User {
@Field(type = FieldType.Text)
private String id;
@Field(type = FieldType.Text)
private String name;
@Field(type = FieldType.Text)
private String phone;
@Field(type = FieldType.Text)
private String namespace;
// 省略get/set ......
}
增加测试方法findAll与save
client1
Dao
@Repository
public interface UserDao extends CrudRepository<User,String> {
}
Service
@Service
public class TestService {
@Autowired
private UserDao userDao;
public void findAll(){
Iterable<User> all = userDao.findAll();
Iterator<User> iterator = userDao.findAll().iterator();
User next1 = iterator.next();
System.out.println(next1.toString());
}
public void save(){
User user = new User();
user.setId("1");
user.setName("client1");
user.setNamespace("elasticsearch:client1");
user.setPhone("111");
User save = userDao.save(user);
System.out.println(save.toString());
}
}
Test
@RunWith(SpringRunner.class)
@SpringBootTest
public class ClientApplicationTests {
@Autowired
private TestService testService;
@Test
public void findAll(){
testService.findAll();
}
@Test
public void save(){
testService.save();
}
}
client2
Dao
@Repository
public interface UserDao extends CrudRepository<User,String> {
}
Service
@Service
public class TestService {
@Autowired
private UserDao userDao;
public void findAll(){
Iterable<User> all = userDao.findAll();
Iterator<User> iterator = userDao.findAll().iterator();
User next1 = iterator.next();
System.out.println(next1.toString());
}
public void save(){
User user = new User();
user.setId("2");
user.setName("client2");
user.setNamespace("elasticsearch:client2");
user.setPhone("222");
User save = userDao.save(user);
System.out.println(save.toString());
}
}
Test
@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {
@Autowired
private TestService testService;
@Test
public void findAll(){
testService.findAll();
}
@Test
public void save(){
testService.save();
}
}
测试验证
预期结果
生成client1.user与client2.user索引
访问8081返回client1用户信息，访问8082返回client2用户信息
实际结果
总结
我们通过增加一个配置类来获取自定义的namespace,然后在类指定索引名时通过获取变量的形式去读取，这样生成的索引就会带一个前缀，也就是我们想要的namespace·，也就实现了我们最初的目标，复用同一个elasticsearch,达到节省服务器资源的目的
源码地址
https://github.com/TianPuJun/es-demo
https://download.csdn.net/download/C1041067258/85096340
参考链接
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