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Clarify why we save ziplist elements in revserse order.

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Also get rid of variables that are now kinda redundant, since the
dictionary iterator was removed.

This is related to PR #3949.
This commit is contained in:
antirez 2017-04-18 11:01:47 +02:00
parent 0a942f1751
commit c33493277a
1 changed files with 13 additions and 7 deletions
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20
src/rdb.c
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@ -709,17 +709,23 @@ ssize_t rdbSaveObject(rio *rdb, robj *o) {
if ((n = rdbSaveLen(rdb,zsl->length)) == -1) return -1;
nwritten += n;
/* We save the skiplist elements from the greatest to the smallest
* (that's trivial since the elements are already ordered in the
* skiplist): this improves the load process, since the next loaded
* element will always be the smaller, so adding to the skiplist
* will always immediately stop at the head, making the insertion
* O(1) instead of O(log(N)). */
zskiplistNode *zn = zsl->tail;
while (zn != NULL) {
sds ele = zn->ele;
double *score = &zn->score;
if ((n = rdbSaveRawString(rdb,(unsigned char*)ele,sdslen(ele)))
== -1) return -1;
if ((n = rdbSaveRawString(rdb,
(unsigned char*)zn->ele,sdslen(zn->ele))) == -1)
{
return -1;
}
nwritten += n;
if ((n = rdbSaveBinaryDoubleValue(rdb,*score)) == -1) return -1;
if ((n = rdbSaveBinaryDoubleValue(rdb,zn->score)) == -1)
return -1;
nwritten += n;
zn = zn->backward;
}
} else {