Function clusterManagerNodeWithLeastReplicas

app/redis-6.2.6/src/redis-cli.c:4641–4656

 * number of replicas, one at random is returned. */

static clusterManagerNode *clusterManagerNodeWithLeastReplicas() {
    clusterManagerNode *node = NULL;
    int lowest_count = 0;
    listIter li;
    listNode *ln;
    listRewind(cluster_manager.nodes, &li);
    while ((ln = listNext(&li)) != NULL) {
        clusterManagerNode *n = ln->value;
        if (n->flags & CLUSTER_MANAGER_FLAG_SLAVE) continue;
        if (node == NULL || n->replicas_count < lowest_count) {
            node = n;
            lowest_count = n->replicas_count;
        }
    }
    return node;
}

/* This function returns a random master node, return NULL if none */