Node Memcached Verbosity (Detailed Guide w/ Code Examples)

Use Case(s)

Setting the verbosity level in Memcached using Node.js can be useful when debugging or monitoring actions in the cache. The verbosity level determines the amount of logging done by the server, with higher levels indicating more detailed logs.

Code Examples

Here's an example of how you might adjust memcached verbosity using a popular Node.js library - memcached.

1. Set up memcached and set verbosity level

const Memcached = require('memcached');

// Connect to your memcached server
let memcached = new Memcached('localhost:11211');

// Set the verbosity level (e.g., to 2)
memcached.command(function(noreply, command) {
  if (! noreply) throw new Error('Expected noreply');
 
  // This is a raw Memcached command. The "2" is the verbosity level.
  command('verbosity', '2', function(error, results) {
    console.log(results); // Should log "OK"
  });
});

In this example, we're connecting to a local Memcached instance and issuing a raw command to set verbosity level. The raw command 'verbosity' followed by '2' sets the verbosity level to 2. The callback function logs the result of the command.

Please note that this will only affect the current session, as memcached does not persist settings between restarts.

Best Practices

• Adjust verbosity only when necessary: High verbosity levels can potentially influence performance and fill up your logs quickly, so it's best to use it sparingly for debugging or performance tuning.
• Ensure to reset verbosity to the default or lower level after debugging to prevent unnecessary logging and potential performance degradation.

Common Mistakes

• Not resetting verbosity: If you don't reset the verbosity level after debugging, you might end up with extremely large log files that can degrade performance and use up storage space.
• Using high verbosity in production: Unless necessary for debugging, it’s not recommended to use a high verbosity level in production environments due to potential performance impact.

FAQs

Q: Are changes to Memcached verbosity levels persistent?

A: No. Memcached does not persist settings between restarts. Any change to the verbosity level will only affect the current session.