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Rewrite chunk system (#8177)

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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.
This commit is contained in:
Spottedleaf
2022-09-26 01:02:51 -07:00
parent 614f528234
commit 0f1a8717e8
122 changed files with 18921 additions and 12279 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
patches/server/Duplicate-UUID-Resolve-Option.patch
View File

@@ -41,9 +41,17 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
public static void onEntityPreAdd(final ServerLevel level, final Entity entity) {
-
+ // Paper start - duplicate uuid resolving
+ if (net.minecraft.server.level.ChunkMap.checkDupeUUID(level, entity)) {
+ return;
+ }
+ if (net.minecraft.world.level.Level.DEBUG_ENTITIES && ((Entity) entity).level.paperConfig().entities.spawning.duplicateUuid.mode != io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode.NOTHING) {
+ if (((Entity) entity).addedToWorldStack != null) {
+ ((Entity) entity).addedToWorldStack.printStackTrace();
+ }
+ net.minecraft.server.level.ServerLevel.getAddToWorldStackTrace((Entity) entity).printStackTrace();
+ }
+ // Paper end - duplicate uuid resolving
}
public static void onChunkHolderCreate(final ServerLevel level, final ChunkHolder holder) {
@@ -60,7 +68,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
}));
// CraftBukkit end
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
});
throw new UnsupportedOperationException(); // Paper - rewrite chunk system
}
+ // Paper start
@@ -107,32 +115,5 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ }
+ // Paper end
public CompletableFuture<Either<LevelChunk, ChunkHolder.ChunkLoadingFailure>> prepareTickingChunk(ChunkHolder holder) {
ChunkPos chunkcoordintpair = holder.getPos();
CompletableFuture<Either<List<ChunkAccess>, ChunkHolder.ChunkLoadingFailure>> completablefuture = this.getChunkRangeFuture(chunkcoordintpair, 1, (i) -> {
diff --git a/src/main/java/net/minecraft/world/level/entity/PersistentEntitySectionManager.java b/src/main/java/net/minecraft/world/level/entity/PersistentEntitySectionManager.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/level/entity/PersistentEntitySectionManager.java
+++ b/src/main/java/net/minecraft/world/level/entity/PersistentEntitySectionManager.java
@@ -0,0 +0,0 @@ public class PersistentEntitySectionManager<T extends EntityAccess> implements A
private boolean addEntityUuid(T entity) {
if (!this.knownUuids.add(entity.getUUID())) {
+ // Paper start
+ T conflict = this.visibleEntityStorage.getEntity(entity.getUUID());
+ if (conflict != null && ((Entity) conflict).isRemoved()) {
+ stopTracking(conflict); // remove the existing entity
+ return true;
+ }
+ // Paper end
PersistentEntitySectionManager.LOGGER.warn("UUID of added entity already exists: {}", entity);
+ // Paper start
+ if (net.minecraft.world.level.Level.DEBUG_ENTITIES && ((Entity) entity).level.paperConfig().entities.spawning.duplicateUuid.mode != io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode.NOTHING) {
+ if (((Entity) entity).addedToWorldStack != null) {
+ ((Entity) entity).addedToWorldStack.printStackTrace();
+ }
+ net.minecraft.server.level.ServerLevel.getAddToWorldStackTrace((Entity) entity).printStackTrace();
+ }
+ // Paper end
return false;
} else {
return true;
throw new UnsupportedOperationException(); // Paper - rewrite chunk system
}