A description
One type redis set (collection)
Two, redis its internal implementation
1: hashmap (hash table) to achieve the hash table, key = value, value = null can, hash links
2: intset- can be understood as an ordered array of positive numbers
Third, the data structure definition intset
contents: byte array, which may have 16bit, 32bit, 64bit encoded into an integer manner
encoding:INTSET_ENC_INT16,INTSET_ENC_INT32,INTSET_ENC_INT64
Four, redis use
1.contents stored as an array of integers, and which ensures the orderly
2. Because the contents ordered, and by the encoding contents encoding format unification, so take a binary search query
5, configuration parameters control
set-max-intset-entries, indicating a maximum integer not more than this value, using the stored IntSet type, in order to save memory consumption
