slot missing

[smallollams]

I am reading the source code as below:

` int cluster_dist_add_key(redisCluster *c, HashTable *ht, char *key,size_t key_len, clusterKeyVal **kv){
int key_free;
short slot;
clusterDistList *dl;
clusterKeyVal *retptr;

// Prefix our key and hash it
key_free = redis_key_prefix(c->flags, &key, &key_len);
slot = cluster_hash_key(key, key_len);

// We can't do this if we don't fully understand the keyspace
if (c->master[slot] == NULL) {
    if (key_free) efree(key);
    return FAILURE;
}

...`

my question is what bad things could lead to the situation “don't fully understand the keyspace”
thank you for reply

[michael-grunder]

I don't think it should happen in normal conditions, but this is just defensive programming.

It's always good practice to test for such things in C 😄

[smallollams]

thank you,but i have encountered a problem. when invoke the "set" method to save data in redis,but finally，my data is not in redis without an exception

[michael-grunder]

I'd need more information to help diagnose the issue you're having.

Can you provide a small example that replicates the problem? The only other suggestion I'd have is to try and do normal debugging to narrow down exactly when this issue is occuring.