freecache why not introduce singleflight for hot key issue?

[beijingzhangwei]

freecache why not introduce singleflight for hot key issue? or any reason?

[coocood]

Can you be more specific about the hot key issue?

[beijingzhangwei]

My business has a scenario ：where a large number（10Kqps） of requests for access to the same key data will be made in the same time.

1:
If the data not in cache and not in remote storage, the request will penetrate to the downstream business, which will increase the pressure on the downstream business. This is a Unusual case...
2:
Freecache use segment lock, pending all other requests . But, if the segment lock release by the first goroutine, other goroutines need query the key from memory cache again. I think why not just give the first goroutine's result to other pending goroutines.

[lypee]

觉得这个提案很好