Lab
Q1：Lab1比较简单，分别实现Worker.go和Master.go里的代码逻辑就行，主要讲一下超时机制，也就是在crash条件下，worker可能无法完成工作的情况？
解决思路是：在
Master里起一个协程manager_unfinish，里面有一个类似于UnMapWork的channel,Master给Worker分配任务的时候顺便将任务id同时push到这个channel中，manager_unfinish从channel收到任务id后就另外起协程map_time_alert，它们的工作是先计时10s，然后看对应的Worker是否完成并返回，否则就讲此任务id再一次push到MapWork的channel中，继续分配任务。Reduce也是同理。
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