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dict.c: don't try buckets that are empty for sure in dictGetRandomKey().

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This is very similar to the optimization applied to dictGetRandomKeys,
but applied to the single key variant.

Related to issue #2306.
This commit is contained in:
antirez 2015-02-05 12:15:58 +01:00
parent 1bcf67a75f
commit 4f427bc298
1 changed files with 5 additions and 1 deletions
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6
src/dict.c
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@ -631,7 +631,11 @@ dictEntry *dictGetRandomKey(dict *d)
if (dictIsRehashing(d)) _dictRehashStep(d);
if (dictIsRehashing(d)) {
do {
h = random() % (d->ht[0].size+d->ht[1].size);
/* We are sure there are no elements in indexes from 0
* to rehashidx-1 */
h = d->rehashidx + (random() % (d->ht[0].size +
d->ht[1].size -
d->rehashidx));
he = (h >= d->ht[0].size) ? d->ht[1].table[h - d->ht[0].size] :
d->ht[0].table[h];
} while(he == NULL);