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ruanhaishen
redis
Commits
996a6437
Commit
996a6437
authored
Feb 25, 2013
by
antirez
Browse files
Cluster: use O(log(N)) algo for countKeysInSlot().
parent
d4fa4065
Changes
2
Show whitespace changes
Inline
Side-by-side
src/db.c
View file @
996a6437
...
...
@@ -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
;
}
src/redis.h
View file @
996a6437
...
...
@@ -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);
...
...
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