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sundb authored
Improve memory efficiency of list keys ## Description of the feature The new listpack encoding uses the old `list-max-listpack-size` config to perform the conversion, which we can think it of as a node inside a quicklist, but without 80 bytes overhead (internal fragmentation included) of quicklist and quicklistNode structs. For example, a list key with 5 items of 10 chars each, now takes 128 bytes instead of 208 it used to take. ## Conversion rules * Convert listpack to quicklist When the listpack length or size reaches the `list-max-listpack-size` limit, it will be converted to a quicklist. * Convert quicklist to listpack When a quicklist has only one node, and its length or size is reduced to half of the `list-max-listpack-size` limit, it will be converted to a listpack. This is done to avoid frequent conversions when we add or remove at the bounding size or length. ## Interface changes 1. add list entry param to listTypeSetIte...2168ccc6