Go High-Performance Programming EP7: Use singleflight To Merge The Same Request
Understanding Cache Penetration and Mitigation Strategies
Using cached database data to accelerate queries is common in developing business applications. However, this architecture presents challenges like cache penetration, avalanche, and cache breakdown. Cache breakdown occurs in high-concurrency systems when numerous requests simultaneously query an expired key, leading to a surge in database requests and significantly increasing the database load. If we can combine multiple identical requests into one within a short period, the database load can be reduced from N requests to just 1.
SingleFlight is a concurrency primitive that addresses this problem. This article introduces the usage and basic principles of SingleFlight and provides some details on its implementation.
Figure 1: Merging Identical Requests with SingleFlight
Using SingleFlight
The Go language team has placed singleflight in the golang.org/x directory, indicating that it may undergo future changes. This package provides aā¦
