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Cluster: use O(log(N)) algo for countKeysInSlot().

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This commit is contained in:
antirez 2013-02-25 12:37:50 +01:00
parent d4fa40655d
commit 996a643752
2 changed files with 23 additions and 8 deletions
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27
src/db.c
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@ -780,17 +780,30 @@ unsigned int getKeysInSlot(unsigned int hashslot, robj **keys, unsigned int coun
}
unsigned int countKeysInSlot(unsigned int hashslot) {
zskiplistNode *n;
zskiplist *zsl = server.cluster->slots_to_keys;
zskiplistNode *zn;
zrangespec range;
int j = 0;
int rank, count = 0;
range.min = range.max = hashslot;
range.minex = range.maxex = 0;
n = zslFirstInRange(server.cluster->slots_to_keys, range);
while(n && n->score == hashslot) {
j++;
n = n->level[0].forward;
/* Find first element in range */
zn = zslFirstInRange(zsl, range);
/* Use rank of first element, if any, to determine preliminary count */
if (zn != NULL) {
rank = zslGetRank(zsl, zn->score, zn->obj);
count = (zsl->length - (rank - 1));
/* Find last element in range */
zn = zslLastInRange(zsl, range);
/* Use rank of last element, if any, to determine the actual count */
if (zn != NULL) {
rank = zslGetRank(zsl, zn->score, zn->obj);
count -= (zsl->length - rank);
}
return j;
}
return count;
}

2
src/redis.h
View File

@ -1129,11 +1129,13 @@ zskiplistNode *zslInsert(zskiplist *zsl, double score, robj *obj);
unsigned char *zzlInsert(unsigned char *zl, robj *ele, double score);
int zslDelete(zskiplist *zsl, double score, robj *obj);
zskiplistNode *zslFirstInRange(zskiplist *zsl, zrangespec range);
zskiplistNode *zslLastInRange(zskiplist *zsl, zrangespec range);
double zzlGetScore(unsigned char *sptr);
void zzlNext(unsigned char *zl, unsigned char **eptr, unsigned char **sptr);
void zzlPrev(unsigned char *zl, unsigned char **eptr, unsigned char **sptr);
unsigned int zsetLength(robj *zobj);
void zsetConvert(robj *zobj, int encoding);
unsigned long zslGetRank(zskiplist *zsl, double score, robj *o);
/* Core functions */
int freeMemoryIfNeeded(void);