dubbo-spring-boot-actuator

Dubbo Spring Boot Production-Ready

dubbo-spring-boot-actuator provides production-ready features (e.g. health checks, endpoints, and externalized configuration).

Content

1. Main Content
2. Integrate with Maven
3. Health Checks
4. Endpoints
5. Externalized Configuration

Versions

For now, dubbo-spring-boot-actuator will separate two versions for Spring Boot 2.x and 1.x once release :

• 0.2.x is a main stream release version for Spring Boot 2.x

• 0.1.x is a legacy version for maintaining Spring Boot 1.x

  ​

Integrate with Maven

You can introduce the latest dubbo-spring-boot-actuator to your project by adding the following dependency to your pom.xml

<dependency>
    <groupId>com.alibaba.boot</groupId>
    <artifactId>dubbo-spring-boot-actuator</artifactId>
    <version>0.2.0-SNAPSHOT</version>
</dependency>

If your project failed to resolve the dependency, try to add the following repository:

<repositories>
    <repository>
        <id>sonatype-nexus-snapshots</id>
        <url>https://oss.sonatype.org/content/repositories/snapshots</url>
        <releases>
            <enabled>false</enabled>
        </releases>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
</repositories>

Health Checks

dubbo-spring-boot-actuator supports the standard Spring Boot HealthIndicator as a production-ready feature , which will be aggregated into Spring Boot's Health and exported on HealthEndpoint that works MVC (Spring Web MVC) and JMX (Java Management Extensions) both if they are available.

Web Endpoint : /health

Suppose a Spring Boot Web application did not specify management.server.port, you can access http://localhost:8080/actuator/health via Web Client and will get a response with JSON format is like below :

{
  "status": "UP",
  "dubbo": {
    "status": "UP",
    "memory": {
      "source": "management.health.dubbo.status.defaults",
      "status": {
        "level": "OK",
        "message": "max:3641M,total:383M,used:92M,free:291M",
        "description": null
      }
    },
    "load": {
      "source": "management.health.dubbo.status.extras",
      "status": {
        "level": "OK",
        "message": "load:1.73583984375,cpu:8",
        "description": null
      }
    },
    "threadpool": {
      "source": "management.health.dubbo.status.extras",
      "status": {
        "level": "OK",
        "message": "Pool status:OK, max:200, core:200, largest:0, active:0, task:0, service port: 12345",
        "description": null
      }
    },
    "server": {
      "source": "[email protected]()",
      "status": {
        "level": "OK",
        "message": "/192.168.1.103:12345(clients:0)",
        "description": null
      }
    }
  }
  // ignore others
}

In samples , /health Web Endpoints are exposed on http://localhost:8081/health (consumer)

memory, load, threadpool and server are Dubbo's build-in StatusCheckers in above example. Dubbo allows the application to extend StatusChecker's SPI.

Default , memory and load will be added into Dubbo's HealthIndicator , it could be overridden by externalized configuration StatusChecker's defaults.

JMX Endpoint : Health

Health is a JMX (Java Management Extensions) Endpoint with ObjectName org.springframework.boot:type=Endpoint,name=Health , it can be managed by JMX agent ,e.g. JDK tools : jconsole and so on.

Build-in StatusCheckers

META-INF/dubbo/internal/com.alibaba.dubbo.common.status.StatusChecker declares Build-in StatusCheckers as follow :

registry=com.alibaba.dubbo.registry.status.RegistryStatusChecker
spring=com.alibaba.dubbo.config.spring.status.SpringStatusChecker
datasource=com.alibaba.dubbo.config.spring.status.DataSourceStatusChecker
memory=com.alibaba.dubbo.common.status.support.MemoryStatusChecker
load=com.alibaba.dubbo.common.status.support.LoadStatusChecker
server=com.alibaba.dubbo.rpc.protocol.dubbo.status.ServerStatusChecker
threadpool=com.alibaba.dubbo.rpc.protocol.dubbo.status.ThreadPoolStatusChecker

The property key that is name of StatusChecker can be a valid value of management.health.dubbo.status.* in externalized configuration.

Endpoints

Actuator endpoint dubbo supports Actuator Endpoints :

ID	Enabled	HTTP URI	HTTP Method	Description	Content Type
dubbo	true	/actuator/dubbo	GET	Exposes Dubbo's meta data	application/json
dubbo-properties	true	/actuator/dubbo/properties	GET	Exposes all Dubbo's Properties	application/json
dubbo-services	false	/dubbo/services	GET	Exposes all Dubbo's ServiceBean	application/json
dubbo-references	false	/actuator/dubbo/references	GET	Exposes all Dubbo's ReferenceBean	application/json
dubbo-configs	true	/actuator/dubbo/configs	GET	Exposes all Dubbo's *Config	application/json
dubbo-shutdown	false	/actuator/dubbo/shutdown	POST	Shutdown Dubbo services	application/json

Web Endpoints

/actuator/dubbo

/dubbo exposes Dubbo's meta data :

{
  "timestamp": 1516623290166,
  "versions": {
    "dubbo-spring-boot": "0.2.0-SNAPSHOT"
    "dubbo": "2.6.2"
  },
  "urls": {
    "dubbo": "https://github.com/alibaba/dubbo",
    "google-group": "http://groups.google.com/group/dubbo",
    "github": "https://github.com/dubbo/dubbo-spring-boot-project",
    "issues": "https://github.com/dubbo/dubbo-spring-boot-project/issues",
    "git": "https://github.com/dubbo/dubbo-spring-boot-project.git"
  }
}

/actuator/dubbo/properties

/actuator/dubbo/properties exposes all Dubbo's Properties from Spring Boot Externalized Configuration (a.k.a PropertySources) :

{
  "dubbo.application.id": "dubbo-provider-demo",
  "dubbo.application.name": "dubbo-provider-demo",
  "dubbo.application.qos-enable": "false",
  "dubbo.application.qos-port": "33333",
  "dubbo.protocol.id": "dubbo",
  "dubbo.protocol.name": "dubbo",
  "dubbo.protocol.port": "12345",
  "dubbo.registry.address": "N/A",
  "dubbo.registry.id": "my-registry",
  "dubbo.scan.basePackages": "com.alibaba.boot.dubbo.demo.provider.service"
}

The structure of JSON is simple Key-Value format , the key is property name as and the value is property value.

/actuator/dubbo/services

/actuator/dubbo/services exposes all Dubbo's ServiceBean that are declared via <dubbo:service/> or @Service present in Spring ApplicationContext :

{
  "[email protected]#defaultDemoService": {
    "accesslog": null,
    "actives": null,
    "cache": null,
    "callbacks": null,
    "class": "com.alibaba.dubbo.config.spring.ServiceBean",
    "cluster": null,
    "connections": null,
    "delay": null,
    "document": null,
    "executes": null,
    "export": null,
    "exported": true,
    "filter": "",
    "generic": "false",
    "group": null,
    "id": "com.alibaba.boot.dubbo.demo.api.DemoService",
    "interface": "com.alibaba.boot.dubbo.demo.api.DemoService",
    "interfaceClass": "com.alibaba.boot.dubbo.demo.api.DemoService",
    "layer": null,
    "listener": "",
    "loadbalance": null,
    "local": null,
    "merger": null,
    "mock": null,
    "onconnect": null,
    "ondisconnect": null,
    "owner": null,
    "path": "com.alibaba.boot.dubbo.demo.api.DemoService",
    "proxy": null,
    "retries": null,
    "scope": null,
    "sent": null,
    "stub": null,
    "timeout": null,
    "token": null,
    "unexported": false,
    "uniqueServiceName": "com.alibaba.boot.dubbo.demo.api.DemoService:1.0.0",
    "validation": null,
    "version": "1.0.0",
    "warmup": null,
    "weight": null,
    "serviceClass": "com.alibaba.boot.dubbo.demo.provider.service.DefaultDemoService"
  }
}

The key is the Bean name of ServiceBean , ServiceBean's properties compose value.

/actuator/dubbo/references

/actuator/dubbo/references exposes all Dubbo's ReferenceBean that are declared via @Reference annotating on Field or Method :

{
  "private com.alibaba.boot.dubbo.demo.api.DemoService com.alibaba.boot.dubbo.demo.consumer.controller.DemoConsumerController.demoService": {
    "actives": null,
    "cache": null,
    "callbacks": null,
    "class": "com.alibaba.dubbo.config.spring.ReferenceBean",
    "client": null,
    "cluster": null,
    "connections": null,
    "filter": "",
    "generic": null,
    "group": null,
    "id": "com.alibaba.boot.dubbo.demo.api.DemoService",
    "interface": "com.alibaba.boot.dubbo.demo.api.DemoService",
    "interfaceClass": "com.alibaba.boot.dubbo.demo.api.DemoService",
    "layer": null,
    "lazy": null,
    "listener": "",
    "loadbalance": null,
    "local": null,
    "merger": null,
    "mock": null,
    "objectType": "com.alibaba.boot.dubbo.demo.api.DemoService",
    "onconnect": null,
    "ondisconnect": null,
    "owner": null,
    "protocol": null,
    "proxy": null,
    "reconnect": null,
    "retries": null,
    "scope": null,
    "sent": null,
    "singleton": true,
    "sticky": null,
    "stub": null,
    "stubevent": null,
    "timeout": null,
    "uniqueServiceName": "com.alibaba.boot.dubbo.demo.api.DemoService:1.0.0",
    "url": "dubbo://localhost:12345",
    "validation": null,
    "version": "1.0.0",
    "invoker": {
      "class": "com.alibaba.dubbo.common.bytecode.proxy0"
    }
  }
}

The key is the string presentation of @Reference Field or Method , ReferenceBean's properties compose value.

/actuator/dubbo/configs

/actuator/dubbo/configs exposes all Dubbo's *Config :

{
  "ApplicationConfig": {
    "dubbo-consumer-demo": {
      "architecture": null,
      "class": "com.alibaba.dubbo.config.ApplicationConfig",
      "compiler": null,
      "dumpDirectory": null,
      "environment": null,
      "id": "dubbo-consumer-demo",
      "logger": null,
      "name": "dubbo-consumer-demo",
      "organization": null,
      "owner": null,
      "version": null
    }
  },
  "ConsumerConfig": {
    
  },
  "MethodConfig": {
    
  },
  "ModuleConfig": {
    
  },
  "MonitorConfig": {
    
  },
  "ProtocolConfig": {
    "dubbo": {
      "accepts": null,
      "accesslog": null,
      "buffer": null,
      "charset": null,
      "class": "com.alibaba.dubbo.config.ProtocolConfig",
      "client": null,
      "codec": null,
      "contextpath": null,
      "dispatcher": null,
      "dispather": null,
      "exchanger": null,
      "heartbeat": null,
      "host": null,
      "id": "dubbo",
      "iothreads": null,
      "name": "dubbo",
      "networker": null,
      "path": null,
      "payload": null,
      "port": 12345,
      "prompt": null,
      "queues": null,
      "serialization": null,
      "server": null,
      "status": null,
      "telnet": null,
      "threadpool": null,
      "threads": null,
      "transporter": null
    }
  },
  "ProviderConfig": {
    
  },
  "ReferenceConfig": {
    
  },
  "RegistryConfig": {
    
  },
  "ServiceConfig": {
    
  }
}

The key is the simple name of Dubbo *Config Class , the value is*Config Beans' Name-Properties Map.

/actuator/dubbo/shutdown

/actuator/dubbo/shutdown shutdowns Dubbo's components including registries, protocols, services and references :

{
    "shutdown.count": {
        "registries": 0,
        "protocols": 1,
        "services": 0,
        "references": 1
    }
}

"shutdown.count" means the count of shutdown of Dubbo's components , and the value indicates how many components have been shutdown.

Externalized Configuration

StatusChecker Defaults

management.health.dubbo.status.defaults is a property name for setting names of StatusCheckers , its value is allowed to multiple-values , for example :

management.health.dubbo.status.defaults = registry,memory,load

Default Value

The default value is :

management.health.dubbo.status.defaults = memory,load

StatusChecker Extras

management.health.dubbo.status.extras is used to override the [StatusChecker's defaults] , the multiple-values is delimited by comma :

management.health.dubbo.status.extras = load,threadpool

Health Checks Enabled

management.health.dubbo.enabled is a enabled configuration to turn on or off health checks feature, its' default is true.

If you'd like to disable health checks , you chould apply management.health.dubbo.enabled to be false:

management.health.dubbo.enabled = false

Endpoints Enabled

Dubbo Spring Boot providers actuator endpoints , however some of them are disable. If you'd like to enable them , please add following properties into externalized configuration :

# Enables Dubbo All Endpoints
management.endpoint.dubbo.enabled = true
management.endpoint.dubbo-shutdown.enabled = true
management.endpoint.dubbo-configs.enabled = true
management.endpoint.dubbo-services.enabled = true
management.endpoint.dubbo-references.enabled = true
management.endpoint.dubbo-properties.enabled = true