一个简单的任务执行引擎设计 - JavaNerd - 博客园



一个简单的任务执行引擎设计 - JavaNerd - 博客园

最近做的一个项目是一个数据库服务化的管控平台,用时髦一点的名词来说是一个DBaaS产品。这种面向云化的产品,呈现给最终用户的体验是提供一个管理页面,把数据库的生命周期,监控等功能通过WEB页面或者Open API暴露给用户或者第三方的程序,常见的产品类似于阿里云或者AWS的RDS。而我们的做的产品实际上是一个分布式的数据库服务平台,除了底层的存储,还有上层的proxy去完成分库分表,读写分离等操作。

对于终端用户来说,使用的是一个数据库连接,但实际上在后面,会有很多系统一同工作。例如当用户创建一个RDS的时候,会去创建底层的数据库实例(MySQL,SQL Server等),Loader Blance,Proxy等,而这些组件其实也是由其他系统通过Open API或者RPC的方式暴露给上层应用。作为Paas或者DBaaS的最上层的产品,免不了会调用其他的系统接口去申请资源。那么在代码实现上会碰到一个问题,当依赖多个系统的时候,依次调用各个系统的的过程中,如果中途出错,错误处理比较难。


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