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PHP程序员面试的一些感受

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Jun 23, 2016 pm 01:28 PM

昨天面试一家垂直社区型创业公司，其中一个题目【如何实现多台服务器共用SESSION】，这一道题，自己的回答让面试官十分不满意。

多台服务器SESSION共享，交谈后明白参考面试官出题的意图是多个服务器之间的SESSION公用，相互实时同步，所以我的一个思路是将SESSION保存到SESSION数据库，等于所有的SESSION都存放进去。面试官很不满意，反驳如果并发很大的情况下，如何解决。

在segmentfault讨论这个问题，回答的全部都是说redis、memcached，这样根本就无法实现多台服务器SESSION的公用。其实面试官想得知的是类似于【云SESSION】的功能，现实中这样的场景有其实也不多，所有的服务器完全彻底可以共用实时的。一开始自己拿到这个题目，思路比较混乱，想的太多，想到的第一点就是SESSION多个服务器之间在实时共享，回答存放到db后，而面试官一再强调的是并发量很高。

其实真正的解决方案完全可以参考游戏服务器，分服。

游戏服务器如果并发很大，不可能一直放玩家进去。达到该服务器的承受极限，会提示已满，无法进入。在一开头就先说了一句“应该先考虑硬件配置和带宽是否满足当前需求”，这一句让面试官更加不满。而现实中，其实很多情况下，提高硬件配置、带宽可以大大的缓解并发压力，然后再以程序、服务器的优化来解决并发问题，才是王道，而不应该仅仅局限于只通过PHP，只通过程序这一点这一部分。很多的IT公司用个2G 4G的内存，双核的CPU，硬盘都不是SSD的，却来谈所谓的并发问题。

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