Function clusterManagerCommandReshard

app/redis-6.2.6/src/redis-cli.c:6081–6266

}

static int clusterManagerCommandReshard(int argc, char **argv) {
    int port = 0;
    char *ip = NULL;
    if (!getClusterHostFromCmdArgs(argc, argv, &ip, &port)) goto invalid_args;
    clusterManagerNode *node = clusterManagerNewNode(ip, port);
    if (!clusterManagerLoadInfoFromNode(node, 0)) return 0;
    clusterManagerCheckCluster(0);
    if (cluster_manager.errors && listLength(cluster_manager.errors) > 0) {
        fflush(stdout);
        fprintf(stderr,
                "*** Please fix your cluster problems before resharding\n");
        return 0;
    }
    int slots = config.cluster_manager_command.slots;
    if (!slots) {
        while (slots <= 0 || slots > CLUSTER_MANAGER_SLOTS) {
            printf("How many slots do you want to move (from 1 to %d)? ",
                   CLUSTER_MANAGER_SLOTS);
            fflush(stdout);
            char buf[6];
            int nread = read(fileno(stdin),buf,6);
            if (nread <= 0) continue;
            int last_idx = nread - 1;
            if (buf[last_idx] != '\n') {
                int ch;
                while ((ch = getchar()) != '\n' && ch != EOF) {}
            }
            buf[last_idx] = '\0';
            slots = atoi(buf);
        }
    }
    char buf[255];
    char *to = config.cluster_manager_command.to,
         *from = config.cluster_manager_command.from;
    while (to == NULL) {
        printf("What is the receiving node ID? ");
        fflush(stdout);
        int nread = read(fileno(stdin),buf,255);
        if (nread <= 0) continue;
        int last_idx = nread - 1;
        if (buf[last_idx] != '\n') {
            int ch;
            while ((ch = getchar()) != '\n' && ch != EOF) {}
        }
        buf[last_idx] = '\0';
        if (strlen(buf) > 0) to = buf;
    }
    int raise_err = 0;
    clusterManagerNode *target = clusterNodeForResharding(to, NULL, &raise_err);
    if (target == NULL) return 0;
    list *sources = listCreate();
    list *table = NULL;
    int all = 0, result = 1;
    if (from == NULL) {
        printf("Please enter all the source node IDs.\n");
        printf("  Type 'all' to use all the nodes as source nodes for "
               "the hash slots.\n");
        printf("  Type 'done' once you entered all the source nodes IDs.\n");