Cola是一个分布式的爬虫框架，用户只需编写几个特定的函数，而无需关注分布式运行的细节。任务会自动分配到多台机器上，整个过程对用户是透明的。-Cola is a distributed crawler frame, users only need to write a few specific functions, without attention to detail distributed operation. Tasks are automatically assigned to mult