ShardingSphere Agent

ShardingSphere-Agent module provides an observable framework for ShardingSphere, which is implemented based on Java Agent.

Features

Logging

The logging plugin uses to record logs of ShardingSphere. Supports for File.

Metrics

The metrics plugin uses to collect and expose monitoring metrics. Supports for prometheus.

Tracing

The tracing plugin uses to obtain the link trace information of SQL parsing and SQL execution. Supports for OpenTelemetry.

How To Build

git clone https://github.com/apache/shardingsphere.git
cd shardingsphere
./mvnw clean install -Prelease

Artifact is distribution/agent/target/apache-shardingsphere-${latest.release.version}-shardingsphere-agent-bin.tar.gz

Quick Start

• shardingsphere-agent-{latest.release.version}.jar is the agent startup jar.
• conf/agent.yaml is used to configure and enable plugins.

Quick Start with Proxy

Add the agent to the Proxy directory, as follows:

apache-shardingsphere-{latest.release.version}-shardingsphere-proxy-bin/agent/shardingsphere-agent.jar

Start agent with -g option by bin/start.sh

sh start.sh -g

# following command also works
sh start.sh --agent

Quick Start with JDBC

When using ShardingSphere-JDBC, you need to add javaagent configuration in the startup command, as follows:

java -javaagent:/xx/xx/shardingsphere-agent-{latest.release.version}.jar -jar project-using-shardingsphere-jdbc.jar

Install Customized Plugins

Usage of lib and plugins folders

• lib contains dependencies common to plugins.
• plugins contains all plugins.

Extend via SPI PluginLifecycleService

PluginLifecycleService is the plugin service definition interface, used to start the plugin service. Custom plugins need to implement this interface.

Configure advisors.yaml

advisors.yaml is used to define interception points. The format is as follows:

advisors:
  - target: xxx.TargetClass # class that need interception enhancements
    advice: xxx.XXXAdvice # enhanced class
    pointcuts: # intercept methods
      - name: foo # method name
        type: method # intercept type. configuring "method" when intercepting the method, configuring "constructor" when intercepting the constructor
        params: # method parameters, just satisfy the unique identification method
          - index: 0 # parameter index
            type: java.lang.String # parameter type

The file location is as follows:

• Proxy: META-INF/conf/{plugin-type}-proxy-advisors.yaml
• JDBC: META-INF/conf/{plugin-type}-jdbc-advisors.yaml

Configure more metrics collector into metrics.yaml

metrics.yaml is the metrics definition file. The format is as follows.

metrics:
  - id: xxx_id # metric id
    type: COUNTER # metric type, COUNTER、GAUGE、HISTOGRAM、SUMMARY
    name: xxx_name # metric name
    help: xxx help # metric help