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本文地址：http://flyer0126.iteye.com/blog/1886635
最近一直困扰的问题得到了解决。
项目中利用gearman实现异步处理，worker端涉及对mysql数据库及redis缓存的一系列操作，但是在实际的使用中发现很短时间后就会退出，开始查看log也没什么异常，通过程序端设置set_time_limit(0), try/catch 捕获异常、服务器端查看日志，通过strace 跟踪进程执行时的系统调用等等也没有什么改善，问题依旧，一时感觉很是无解啊。
折腾至最后简化worker端功能，只简单实现redis的List 链表新增一项功能，结果没多长时间服务又停止了。这次查看日志有了新收获，通过查看php-fpm.log.error，发现如下一行提示：
[14-Jun-2013 10:32:30] PHP Fatal error: Uncaught exception 'RedisException' with message 'read error on connection' in XXXX:35
经过查找各方资料，发现是php.ini文件中的一个配置项导致：
default_socket_timeout = 60
由于redis扩展也是基于php 的socket方式实现，因此该参数值同样会起作用。
找到了问题就比较好解决了：
1、直接修改php.ini，将其设置为我们想要的值（这个不推荐）
2、在我们的脚本中通过以下方式设置，这样就比较灵活，不对其他脚本产生影响
ini_set('default_socket_timeout', -1); //不超时
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