9bb482e46f
The repair-peers cache is reset each time repair service loop runs,
and so computed repeatedly for the same slots:
https://github.com/solana-labs/solana/blob/d2b07dca9/core/src/repair_service.rs#L275
This commit uses an LRU cache to persists repair-peers for each slot.
In addition to LRU eviction rules, in order to avoid re-using outdated
data, each entry also has 10 seconds TTL.
(cherry picked from commit a0551b4054)
Co-authored-by: behzad nouri <behzadnouri@gmail.com>