Can the cacheloader process stay alive and keep rebuilding or updating the cache metadata?

[Lucas Rolff]

 > It would help in a use-case when there are 2 NGINX processes, both 
working with the same cache directory.

Why would you want 2 nginx processes to use the same cache directory? 
Explain your situation, what's your end-goal, etc.

If it's no minimize the amount of origin requests, you can build 
multiple layers of cache (fast and slow storage if you want), use load 
balancing mechanisms such as uri based balancing to spread the cache 
cross multiple servers and maybe use some of the special flags for 
balancing, so even if a machine goes down it wouldn't cause a full shift 
of data.

I'm sure that regardless of what your goal is - someone here will be 
able to suggest a (better) and already supported solution.

rnmx18 wrote:
> It would help in a use-case when there are 2 NGINX processes, both working
> with the same cache directory.
>
> NGINX-A runs with a proxy-cache-path /disk1/cache with zone name "cacheA".
>
> NGINX-B runs with the same proxy-cache-path /disk1/cache with zone name
> "cacheB".
>
> When NGINX-B adds content to the cache (say for URL test/a.html), the file
> gets added to cache as /disk/cache1/test/a.html (again, avoiding md5 for
> simplicity).
>
> I think it may be nice if a subsequent request for this URL to NGINX-A would
> result in a hit, as the file is available in the disk. However, today it
> does not result in a HIT, as the in-memory metadata is missing for NGINX-A
> for this URL. So, it would fetch from origin and add it again to cache, and
> update its in-memory metadata.
>
> Otherwise, a restart of NGINX-A would build up the cache metadata for files
> found in the cache directory.
>
> Thanks
> Rajesh
>
> Posted at Nginx Forum: https://forum.nginx.org/read.php?2,276624,276627#msg-276627
>
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