章大侠，发错人了哦，这个不是我咨询的
"Yichun
Zhang (agentzh)" <age...@gmail.com>
发件人: openresty@googlegroups.com
2015-03-10 14:36
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| Re:
[openresty] 关于openresty的全局初始化问题 |
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Hello!
2015-03-09 19:47 GMT-07:00 hxj137:
> 我错误的认为 init_by_lua 是针对单次http req 的,是因为
我在 init_by_lua 中定义了一个全局变量
> 例如 varstatic = 3
>
> 然后在某个请求中
> content_by_lua '
> varstatic = varstatic +1
> ngx.say("varstatic ",varstatic )
> ';
>
> 然后我怎么刷新 值都会是4
注意 nginx 一般会配置多个 worker 进程。各个 worker 进程都有自己独立的
Lua VM 实例。init_by_lua
只是运行在 worker 进程 fork 之前的 master 进程里面的 Lua
VM 中而已。所以 init_by_lua 里面创建的
Lua 全局变量对各个 worker 进程而言只有只读的价值。
如果你要在所有 worker 进程间共享数据，应该使用 lua_shared_dict.
进一步地，应该尽量避免使用 Lua 全局变量，见这里的官方文档中的讨论：
https://github.com/openresty/lua-nginx-module#lua-variable-scope
init_worker_by_lua 配合 ngx.timer.at() 和共享内存字典也可以做复杂的初始化工作，只是要小心处理
race
condition 的问题，即在 timer 完成初始化前，worker 可能已经开始处理请求。
Regards,
-agentzh
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