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Many chunk sections contain parts of their data that are the same for every block they contain. In these cases we can save memory by saving a single value instead of an array of 4096 copies of that value. Block light and block data are most likely to be uniform followed closely by sky light data. Block ids are far less likely to be uniform but give the largest saving when they are. Because of this we use a compact format for every part of the chunk. Memory saved from this technique will vary based on the world but seems to be about 50% on normal Minecraft generated chunks.
CraftBukkit
A Bukkit (Minecraft Server API) implementation
Website: http://bukkit.org
Bugs/Suggestions: http://leaky.bukkit.org
Contributing Guidelines: CONTRIBUTING.md
Compilation
We use maven to handle our dependencies.