dorony

# https://martin.kleppmann.com/2017/01/26/data-loss-in-large-clusters.html
from math import factorial


def compute_data_loss_chance(num_failed_nodes, num_total_nodes, num_replicas, num_shards):
    f = num_failed_nodes
    n = num_total_nodes
    r = num_replicas
    k = num_shards
    nominator = factorial(f) * factorial(n - r)