memc_ignore_client_abort
The memc_ignore_client_abort directive allows NGINX to continue processing requests to memcached, even if the client disconnects prematurely.
Description
The memc_ignore_client_abort directive manages the behavior of NGINX when a client disconnects from the server before the full response is sent. By default, NGINX may abort requests to upstream servers, including memcached, if it detects that the client has closed the connection. Enabling this directive prevents such an abortion, ensuring that NGINX completes the request to the memcached server regardless of the client's connection state. This is particularly useful in scenarios where the backend operations are essential, and the response time is not overly critical—such as when caching data.
When set to 'on', the memc_ignore_client_abort directive effectively instructs NGINX to ignore client disconnects for memcached commands. This means that, even if a client stops listening before the server responds, the memcached operation will still be performed. The implications of this directive can lead to increased resource usage since NGINX will proceed with handling potentially unnecessary upstream requests, but it ensures that important caching operations are not inadvertently skipped due to client behaviors.
In summary, while the directive enhances the robustness of interactions with memcached by decoupling client behavior from server actions, it should be used judiciously, considering the trade-off with resource usage and backend responsiveness.
Config Example
location /example {
set $memc_key $arg_key;
memc_pass 127.0.0.1:11211;
memc_ignore_client_abort on;
}Remember to monitor the resource implications of enabling this directive, as it may lead to unutilized backend operations.
Avoid enabling this directive if your application relies heavily on real-time client feedback, as it could create stale operations.