Node Redis: Get Eviction Policy (Detailed Guide w/ Code Examples)

Use Case(s)

In Node.js applications using Redis, you may often need to determine the current eviction policy of your Redis instance. This is especially useful when working with limited memory resources and needing to manage how Redis data should be evicted when maximum memory is reached.

Code Examples

Here's how you can get the current eviction policy in Node.js Redis:

const redis = require('redis');
const client = redis.createClient();

client.config('get', 'maxmemory-policy', function(err, result) {
    if (err) {
        console.error(err);
    } else {
        console.log('Current Eviction Policy: ', result[1]);
    }
});

In this example, we're using the config command with get option followed by maxmemory-policy. The callback function prints the current eviction policy.

Best Practices

It's recommended to handle possible errors when running the config command to prevent a program crash and provide insights for debugging.

Common Mistakes

A common mistake could be trying to get the policy before the connection to the Redis server is fully established. Make sure the Redis client is ready before attempting to get the eviction policy.

FAQs

Q: Can I change the eviction policy?

A: Yes, the eviction policy can be changed using the config set command.