What are the different Redis eviction policies and how do they compare?

What are the different Redis eviction policies?

Redis has several eviction policies, including LRU (Least Recently Used), LFU (Least Frequently Used), and volatile-lru. Each policy determines how Redis manages memory when it reaches its limit.

How does LRU compare to LFU?

LRU evicts the least recently used keys, while LFU evicts the least frequently accessed keys. LRU is better for temporal locality, whereas LFU is better for data that is accessed consistently over time.

Which eviction policy is the best for caching?

It depends on your use case. LRU is often preferred for caching because it keeps frequently accessed data available, but LFU can be more efficient for datasets with stable access patterns.

Can I configure Redis to use a custom eviction policy?

Redis does not support custom eviction policies directly, but you can implement your own logic in your application to manage keys before they reach the eviction threshold.