I changed the configuration of the application and deployed the new code to production server. Since the application does not parse the configuration files and use precompiled classes I needed to update the cache files.
There is app/console cache:warmup and app/console cache:clear commands. But the cache wasn't updated after invoking these commands, so I had to delete the app/cache folder manually.
Manual deletion is very dangerous operation because it's not atomic so I can remove part of cache during request and this may lead to fatal error.
How should I reload cache?