Previously, PoiChunk#empty would create a new empty poi chunk with
loaded already set to true, as no data was contained in the chunk.
This allowed the poi chunk to skip expensive trips to the main thread.
However, PoiChunk#parse used #empty to create the initial PoiChunk
instance that is then filled with data.
This leads to PoiChunks returned from #parse to already be marked as
loaded, preventing the then needed trip to the tick thread to update
things like the village distance tracker.
To fix this, this commit now marks the PoiChunks loaded state as false
if the parse logic actually read and parsed any data.
This allows the PoiChunk#load method to properly run its callbacks when
called for the first time.
Patch documentation to come
Issues with the old system that are fixed now:
- World generation does not scale with cpu cores effectively.
- Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps.
- Unreliable prioritisation of chunk gen/load calls that block the main thread.
- Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved.
- Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal.
- Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles.
The above list is not complete. The patch documentation will complete it.
New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil.
Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft.
The old legacy chunk system patches have been moved to the removed folder in case we need them again.
Co-authored-by: Shane Freeder <theboyetronic@gmail.com>
Also, restores un/loading worlds mid tick. This will not be officially supported API contract that such a routine is safe, and these restrictions may be restored in the future.
Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
c7c11188 SPIGOT-2620: Add Player#sendBlockChanges()
f63d2b44 Improve annotation test on parameters
3372e7b4 SPIGOT-1244, SPIGOT-6860, SPIGOT-6874: Various Javadoc and formatting fixes
a1e8a9ab PR-793: Ignore .checkstyle file generated by Eclipse IDE
CraftBukkit Changes:
c2c39089e SPIGOT-2620: Add Player#sendBlockChanges()
8209158db PR-1113: Ignore .checkstyle file generated by Eclipse IDE
Spigot Changes:
4aa5ead2 Rebuild patches
* Make WorldCreator#keepSpawnLoaded return the WorldCreator (Fixes#8321)
Thought that I fixed this before push/merge, apparently not, hence, fix
the return type and add mitigation for this.
* Fix patch/build
* Rebuild patches
