两个站点均运行日志捕捉和应用程序，但在这个经过简化的场景中，数据仅进行单向复制，即从主站点复制到备用站点。
Running at both sites are log-capture and apply programs, but in this simplified scenario, data is only replicating one way — from primary to standby.
通过提供横跨多个服务消费者和提供者之间的单一、统一的日志，它同样也简化了维护并改善了可测试性。
It also simplifies maintenance and improves implementation testability by providing a single, unified log that spans between multiple service consumers and providers.
log4j—简化服务器端调试的日志工具。
Log4j — a logging tool that simplifies server-side debugging.
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