Why did you use Redis and in what configuration?

Redis was used as a high-performance in-memory storage for caching data and managing sessions. It was employed to speed up access to frequently requested information, reduce load on the database, and ensure fast system operation.

Redis configuration typically included:

• Running in standalone or cluster mode for scalability and fault tolerance.
• Setting up persistence (RDB or AOF) to save data to disk.
• Using TTL (time to live) for automatic removal of outdated keys.
• Configuring maximum memory volume and eviction policies (e.g., LRU) to manage memory usage.

An example of using Redis for caching in Java with Jedis:

import redis.clients.jedis.Jedis;

public class RedisCache {
    private Jedis jedis = new Jedis("localhost");

    public void put(String key, String value, int ttlSeconds) {
        jedis.setex(key, ttlSeconds, value);
    }

    public String get(String key) {
        return jedis.get(key);
    }
}

Thus, Redis provided fast and efficient handling of data critical for quick access.