Light Cleaner

Requires BKCommonLib for the low-level API's

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Light cleaner is a simple plugin fulfilling a very powerful task: regenerating lighting. It does so running on a dedicated thread, using it's own optimized methods to minimize performance loss for the server. By operating on raw data it is easily capable of chomping through 200 chunks a second!

As of 1.12-v2, it is now also possible to let the plugin automatically clean up light for newly generated chunks. This way there is no need to use the commands while players explore new areas of the world.

Motivation
A bug that has haunted minecraft forever is the infamous dark lighting found all over the place when chunks are generated. You'll find them in caves, against canyon walls, in the nether and even underground! All of this buggy-looking light ruins the aesthetics that makes Minecraft nature beautiful. Worse, the constant client-side fixing of this lighting drags client-side performance down, especially in the nether or extreme biomes.



No more! With a simple command this plugin will eagerly chomp away at millions of blocks, recalculating their light levels completely from scratch. It uses vanilla Minecraft block information for this, which means it will look just as intended.

Another use is repairing light levels after plugins alter blocks in "fast" ways, such as WorldEdit. If blocks are altered while executing the slow server light regeneration function, it would take ages to change blocks. This plugin offers best of both worlds, allowing repairs after the fact.

By utilizing a powerful algorithm combined with smart caching it is capable of regenerating this lighting much faster and more accurately. Lighting can be repaired for all the chunks in your view, or for all the chunks of a world. The main server thread is not stalled while doing these calculations.

Commands
This plugin offers the following commands:

Permissions
Configuration
To turn on automatic cleaning of newly generated chunks, set the following in the config.yml:
To turn on automatic cleaning after players perform WorldEdit/ FastAsyncWorldEdit operations, set the following in the config.yml:
When remaining available memory (in MB) on the server drops too low, light cleaner will pause and save worlds to reduce memory until it can continue. If you run into out of memory problems, raise this value. If you feel it stalls for too long, lower it.
When processing the plugin has to load large areas of chunks as fast as possible. With high concurrency it will queue a lot of chunks for loading at the same time, while with low it may wait a longer time. If you find the plugin affecting server performance too much, lower this value.
If you have worlds that aren't persistently saved to disk, you may want to disable saving on these worlds. This also prevents the plugin from continueing lighting operations when the server is restarted.
FAWE