ajp_temp_file_write_size
The `ajp_temp_file_write_size` directive specifies the maximum size of temporary files that can be written when handling responses from an AJP server.
Description
The ajp_temp_file_write_size directive in NGINX allows you to define the upper limit for temporary files that may be generated when processing a response from an AJP (Apache JServ Protocol) backend server. When requests to the AJP server return large amounts of data, NGINX may need to buffer this data to handle it efficiently. If the data exceeds the limit set by this directive, it results in the creation of temporary files to store this excess data before it is delivered to the client.
This directive can be configured in various contexts, such as http, server, and location, allowing flexibility in how caching and temporary buffering are implemented. Setting an appropriate value for this directive can significantly affect the performance of your application; if set too low, it may lead to excessive disk usage due to multiple temporary files being created. Conversely, a value that is too high may lead to inefficient memory use, especially during peak loads when many requests are being processed simultaneously.
When defining a value for ajp_temp_file_write_size, you would typically specify a numeric size value followed by a suitable unit (e.g., 1m for 1 megabyte). It's important to consider the expected traffic and response sizes from your backend AJP servers to choose a fitting configuration.
Config Example
http {
ajp_temp_file_write_size 1m;
upstream tomcats {
server 127.0.0.1:8009;
keepalive 10;
}
server {
listen 80;
location / {
ajp_pass tomcats;
}
}
}Setting ajp_temp_file_write_size too low may lead to increased disk usage due to frequent temporary file writes and reads.
Ensure the system has sufficient disk space available for temporary file storage, especially if handling large responses.
Monitor performance and adjust the size dynamically based on traffic patterns and response sizes.