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Set dictGetFairRandomKey() samples to 20 for final version.
Distribution improves dramatically: tests show it clearly. Better to have a slower implementation than a wrong one, because random member extraction should be correct or tends to be useless for a number of tasks.
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@ -750,7 +750,7 @@ unsigned int dictGetSomeKeys(dict *d, dictEntry **des, unsigned int count) {
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* that may be constituted of N buckets with chains of different lengths
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* appearing one after the other. Then we report a random element in the range.
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* In this way we smooth away the problem of different chain lenghts. */
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#define GETFAIR_NUM_ENTRIES 10
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#define GETFAIR_NUM_ENTRIES 15
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dictEntry *dictGetFairRandomKey(dict *d) {
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dictEntry *entries[GETFAIR_NUM_ENTRIES];
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unsigned int count = dictGetSomeKeys(d,entries,GETFAIR_NUM_ENTRIES);
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