Function clusterManagerNodeIsEmpty

app/redis-6.2.6/src/redis-cli.c:2949–2969

Checks whether the node is empty. Node is considered not-empty if it has * some key or if it already knows other nodes */

/* Checks whether the node is empty. Node is considered not-empty if it has
 * some key or if it already knows other nodes */
static int clusterManagerNodeIsEmpty(clusterManagerNode *node, char **err) {
    redisReply *info = clusterManagerGetNodeRedisInfo(node, err);
    int is_empty = 1;
    if (info == NULL) return 0;
    if (strstr(info->str, "db0:") != NULL) {
        is_empty = 0;
        goto result;
    }
    freeReplyObject(info);
    info = CLUSTER_MANAGER_COMMAND(node, "CLUSTER INFO");
    if (err != NULL) *err = NULL;
    if (!clusterManagerCheckRedisReply(node, info, err)) {
        is_empty = 0;
        goto result;
    }
    long known_nodes = getLongInfoField(info->str, "cluster_known_nodes");
    is_empty = (known_nodes == 1);
result:
    freeReplyObject(info);
    return is_empty;
}

/* Return the anti-affinity score, which is a measure of the amount of
 * violations of anti-affinity in the current cluster layout, that is, how