المفاتيح الساخنة

في هذا الدرس

detect and mitigate a key that takes a disproportionate share of traffic.

الموضوعات المخطط لها

• A hot key: one product during a flash sale. A Redis node (or one instance) serving it becomes the bottleneck.
• Detect: per-key access counts, redis-cli --hotkeys (needs an LFU policy; verify), or metrics from the client.
• Mitigate: local L1 cache with short TTL in each instance, replicate the key under several names (product:7#1..#4) and read at random, or serve through CDN.
• Combine with stampede protection: a hot key expiring is the worst case.