Async save to remote redis instances

Hello!

I have installed ngx-lua and lua-redis modules on my Linux-server. So the new site's data saved into local Redis DB via Lua code at location section of my nginx. (As I understand in non-blocking mode for other www-clients of my site). But I have some other remote Redis-servers. And I want to save the same data not only into local Redis, but to these remote Redis instances. As I understand if I do that in one Lua-code (local save+remote saves) the www-user need to wait until all save operations have be done. But I want realize remote savings as asynchronous operations. In this case www-user need to wait only local saving to local Redis. Is there any methods in lua-resty API to realize async execution of some lua-code?

The issue mentions ngx-lua, lua-redis, nginx location code, and the ngx_lua cosocket API. Start by reviewing the existing lua-resty-redis API and ngx-lua execution model; done would be a clear determination of whether asynchronous remote saves are supported and a scoped decision about the needed behavior.