Hello,
I have scripts created that clear the cache by deleting all the cache folder or specific files from the cache according to keys. Do I need to reload the server with "killall -HUP nginx" after deleting files?
As I understand, If I just delete the file, the cached object key is still stored on memory. Is it cleared automatically? Does reloading help to clear it? I don't want server RAM to be wasted for storing non-existing objects.

I got concerned about this after I noticed the following records in error.log file:

2014/04/13 03:43:47 [crit] 23617#0: unlink() "/usr/local/nginx/cache/site1/2d/ca/ef5a2b4a35d954542d4c6eeb99dfca2d" failed (2: No such file or directory)

A lot of such errors were generated. I guess NGINX cannot find the deleted file? The generation of these messages ended after I run the "killall -HUP nginx" command on the server.
I have a server running multiple sites, but each site has its own cache folder and own cache key zone name.

Could you please answer my questions?

Thank you,

Rokas Zakarevicius, Ph.D.