Introduction to Cluster Key Slot Logger

Cluster Key Slot Logger is a crucial tool for developers working with Redis clusters. It helps in mapping keys to their respective slots, ensuring efficient distribution of data across the clustered nodes. In this guide, we will delve into various APIs that the library offers, complete with code snippets and an application example.

API Examples

1. Initializing the Logger

The first step is to initialize the logger. This sets up the necessary configurations and prepares the logger for tracking key slots.

  const ClusterKeySlotLogger = require('cluster-key-slot-logger');
  const logger = new ClusterKeySlotLogger();

2. Logging a Key

Log a specific key to see which slot it maps to.

  logger.logKey('user:1001');

3. Get Slot for a Key

Retrieve the slot number for a given key.

  const slot = logger.getSlot('user:1001');
  console.log(`Slot number is: ${slot}`);

4. Logging Multiple Keys

Log multiple keys at once to see their slot mappings.

  const keys = ['user:1001', 'user:1002', 'order:5001'];
  logger.logKeys(keys);

5. Get Slots for Multiple Keys

Retrieve slot numbers for multiple keys in a single call.

  const slots = logger.getSlots(keys);
  console.log(`Slot numbers are: ${slots}`);

Application Example

Building a Redis Cluster Monitoring Tool

Let’s build a simple application that monitors the slot distribution of keys in a Redis cluster.

  const ClusterKeySlotLogger = require('cluster-key-slot-logger');
  const redis = require('redis');
  
  const logger = new ClusterKeySlotLogger();
  const client = redis.createClient();
  
  function monitorKeys(keys) {
      logger.logKeys(keys);

      const slots = logger.getSlots(keys);
      slots.forEach((slot, index) => {
          console.log(`Key ${keys[index]} is in slot ${slot}`);
      });
  }

  client.keys('*', (err, keys) => {
      if (err) throw err;
      monitorKeys(keys);
  });

This application connects to your Redis instance, retrieves all keys, and logs their slot allocations. It’s a helpful tool for ensuring your cluster is properly balanced.

Conclusion

Cluster Key Slot Logger is a straightforward yet effective tool for managing and optimizing Redis clusters. By understanding and utilizing its APIs, you can ensure efficient key distribution and improve your application’s performance.

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