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negative caching implemented

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This commit is contained in:
antirez
2010-12-31 17:32:59 +01:00
parent c4b64a1395
commit d934e1e85b
4 changed files with 102 additions and 28 deletions
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13
src/db.c
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@ -38,6 +38,8 @@ robj *lookupKey(redisDb *db, robj *key) {
* async loading of this key, what may happen is that the old
* key is loaded in memory if this gets deleted in the meantime. */
if (server.ds_enabled && cacheKeyMayExist(db,key)) {
redisLog(REDIS_DEBUG,"Force loading key %s via lookup",
key->ptr);
val = dsGet(db,key,&expire);
if (val) {
int retval = dbAdd(db,key,val);
@ -142,14 +144,13 @@ robj *dbRandomKey(redisDb *db) {
/* Delete a key, value, and associated expiration entry if any, from the DB */
int dbDelete(redisDb *db, robj *key) {
/* If VM is enabled make sure to awake waiting clients for this key:
* deleting the key will kill the I/O thread bringing the key from swap
* to memory, so the client will never be notified and unblocked if we
* don't do it now. */
/* If diskstore is enabled make sure to awake waiting clients for this key
* as it is not really useful to wait for a key already deleted to be
* loaded from disk. */
if (server.ds_enabled) handleClientsBlockedOnSwappedKey(db,key);
/* FIXME: we need to delete the IO Job loading the key, or simply we can
* wait for it to finish. */
/* Mark this key as non existing on disk as well */
cacheSetKeyDoesNotExistRemember(db,key);
/* Deleting an entry from the expires dict will not free the sds of
* the key, because it is shared with the main dictionary. */