Opened 3 months ago

#1719 new enhancement

Enhance proxy_cache_min_uses directive

Reported by: vadim.lazovskiy@… Owned by:
Priority: minor Milestone:
Component: other Version: 1.15.x
Keywords: Cc:
uname -a:
nginx -V: nginx version: nginx/1.15.8 built by gcc 6.3.0 20170516 (Debian 6.3.0-18+deb9u1) built with OpenSSL 1.1.0j 20 Nov 2018 TLS SNI support enabled configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-g -O2 -fdebug-prefix-map=/data/builder/debuild/nginx-1.15.8/debian/debuild-base/nginx-1.15.8=. -specs=/usr/share/dpkg/no-pie-compile.specs -fstack-protector-strong -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fPIC' --with-ld-opt='-specs=/usr/share/dpkg/no-pie-link.specs -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -pie'

Description

When using nginx for caching large high traffic media it may have sense to use proxy_cache_min_uses directive. But currently it accepts only numeric constant, so it's functionality is limited.
There are valid use cases requiring some smart values for proxy_cache_min_uses.

Let's assume we have a nginx proxy with caching on SSD. These kind of drives tend to wear out quickly when used in high-write applications. To save IO it might be beneficial to cache only realy frequent requests and keep cache as hot as possible.

From my point of view setting this directive automatically to the value above least recent used entry score stored in appropriate cache_zone will do the trick. As the result it will reduce cache writes for infrequent requests and keep it red-hot for it size.

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