bb4943d8a7
To output one random sample, weighted_best generates n random numbers:
https://github.com/solana-labs/solana/blob/f751a5d4e/core/src/weighted_shuffle.rs#L38-L63
WeightedIndex does so with only one random number:
https://github.com/rust-random/rand/blob/eb02f0e46/src/distributions/weighted_index.rs#L223-L240
Additionally, if the index is already constructed, it only does a total
of O(log(n)) amount of work; which can be achieved if RepairCache,
caches the weighted index:
https://github.com/solana-labs/solana/blob/f751a5d4e/core/src/serve_repair.rs#L83
Also, the repair-peers code can be reorganized to have fewer redundant
unlock-then-lock code.
(cherry picked from commit c3048b451d)
Co-authored-by: behzad nouri <behzadnouri@gmail.com>