fluencelabs/redis
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take a hashslot -> keys index, will be used for cluster rehasing

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This commit is contained in:
antirez
2011-04-28 19:00:33 +02:00
parent 45b0f6fb14
commit c772d9c6e7
4 changed files with 73 additions and 29 deletions
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40
src/db.c
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@ -2,6 +2,9 @@
#include <signal.h>
void SlotToKeyAdd(robj *key);
void SlotToKeyDel(robj *key);
/*-----------------------------------------------------------------------------
* C-level DB API
*----------------------------------------------------------------------------*/
@ -131,6 +134,7 @@ int dbAdd(redisDb *db, robj *key, robj *val) {
sds copy = sdsdup(key->ptr);
dictAdd(db->dict, copy, val);
if (server.ds_enabled) cacheSetKeyMayExist(db,key);
if (server.cluster_enabled) SlotToKeyAdd(key);
return REDIS_OK;
}
}
@ -146,6 +150,7 @@ int dbReplace(redisDb *db, robj *key, robj *val) {
if ((oldval = dictFetchValue(db->dict,key->ptr)) == NULL) {
sds copy = sdsdup(key->ptr);
dictAdd(db->dict, copy, val);
if (server.cluster_enabled) SlotToKeyAdd(key);
retval = 1;
} else {
dictReplace(db->dict, key->ptr, val);
@ -198,7 +203,12 @@ int dbDelete(redisDb *db, robj *key) {
/* Deleting an entry from the expires dict will not free the sds of
* the key, because it is shared with the main dictionary. */
if (dictSize(db->expires) > 0) dictDelete(db->expires,key->ptr);
return dictDelete(db->dict,key->ptr) == DICT_OK;
if (dictDelete(db->dict,key->ptr) == DICT_OK) {
if (server.cluster_enabled) SlotToKeyDel(key);
return 1;
} else {
return 0;
}
}
/* Empty the whole database.
@ -698,3 +708,31 @@ int *zunionInterGetKeys(struct redisCommand *cmd,robj **argv, int argc, int *num
*numkeys = num;
return keys;
}
/* Slot to Key API. This is used by Redis Cluster in order to obtain in
* a fast way a key that belongs to a specified hash slot. This is useful
* while rehashing the cluster. */
void SlotToKeyAdd(robj *key) {
unsigned int hashslot = keyHashSlot(key->ptr,sdslen(key->ptr));
zslInsert(server.cluster.slots_to_keys,hashslot,key);
incrRefCount(key);
}
void SlotToKeyDel(robj *key) {
unsigned int hashslot = keyHashSlot(key->ptr,sdslen(key->ptr));
zslDelete(server.cluster.slots_to_keys,hashslot,key);
}
robj *GetKeyInSlot(unsigned int hashslot) {
zskiplistNode *n;
zrangespec range;
range.min = range.max = hashslot;
range.minex = range.maxex = 0;
n = zslFirstInRange(server.cluster.slots_to_keys, range);
if (!n) return NULL;
return n->obj;
}