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01a13871de
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.
120 lines
6.9 KiB
Diff
120 lines
6.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sat, 21 Jul 2018 14:27:34 -0400
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Subject: [PATCH] Duplicate UUID Resolve Option
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Due to a bug in https://github.com/PaperMC/Paper/commit/2e29af3df05ec0a383f48be549d1c03200756d24
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which was added all the way back in March of 2016, it was unknown (potentially not at the time)
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that an entity might actually change the seed of the random object.
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At some point, EntitySquid did start setting the seed. Due to this shared random, this caused
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every entity to use a Random object with a predictable seed.
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This has caused entities to potentially generate with the same UUID....
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Over the years, servers have had entities disappear, but no sign of trouble
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because CraftBukkit removed the log lines indicating that something was wrong.
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We have fixed the root issue causing duplicate UUID's, however we now have chunk
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files full of entities that have the same UUID as another entity!
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When these chunks load, the 2nd entity will not be added to the world correctly.
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If that chunk loads in a different order in the future, then it will reverse and the
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missing one is now the one added to the world and not the other. This results in very
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inconsistent entity behavior.
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This change allows you to recover any duplicate entity by generating a new UUID for it.
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This also lets you delete them instead if you don't want to risk having new entities added to
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the world that you previously did not see.
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But for those who are ok with leaving this inconsistent behavior, you may use WARN or NOTHING options.
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It is recommended you regenerate the entities, as these were legit entities, and deserve your love.
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diff --git a/src/main/java/net/minecraft/server/ChunkSystem.java b/src/main/java/net/minecraft/server/ChunkSystem.java
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index 0c6534e64ef023cf613f2c5407c7598c6ed81bc6..d38beb8183470a48c4c927b78fbed243eebcfe71 100644
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--- a/src/main/java/net/minecraft/server/ChunkSystem.java
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+++ b/src/main/java/net/minecraft/server/ChunkSystem.java
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@@ -73,7 +73,17 @@ public final class ChunkSystem {
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}
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public static void onEntityPreAdd(final ServerLevel level, final Entity entity) {
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-
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+ // Paper start - duplicate uuid resolving
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+ if (net.minecraft.server.level.ChunkMap.checkDupeUUID(level, entity)) {
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+ return;
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+ }
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+ 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) {
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+ if (((Entity) entity).addedToWorldStack != null) {
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+ ((Entity) entity).addedToWorldStack.printStackTrace();
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+ }
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+ net.minecraft.server.level.ServerLevel.getAddToWorldStackTrace((Entity) entity).printStackTrace();
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+ }
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+ // Paper end - duplicate uuid resolving
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}
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public static void onChunkHolderCreate(final ServerLevel level, final ChunkHolder holder) {
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diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
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index 06b5fecb37621f66780a396774a37292675d90ac..67823979209f9b8a3f44cd21baca667457ef110a 100644
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--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
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+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
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@@ -522,6 +522,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
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entity.discard();
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needsRemoval = true;
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}
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+ checkDupeUUID(world, entity); // Paper
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return !needsRemoval;
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}));
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// CraftBukkit end
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@@ -533,6 +534,49 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
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throw new UnsupportedOperationException(); // Paper - rewrite chunk system
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}
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+ // Paper start
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+ // rets true if to prevent the entity from being added
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+ public static boolean checkDupeUUID(ServerLevel level, Entity entity) {
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+ io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode mode = level.paperConfig().entities.spawning.duplicateUuid.mode;
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+ if (mode != io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode.WARN
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+ && mode != io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode.DELETE
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+ && mode != io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode.SAFE_REGEN) {
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+ return false;
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+ }
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+ Entity other = level.getEntity(entity.getUUID());
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+
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+ if (other == null || other == entity) {
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+ return false;
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+ }
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+
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+ if (mode == io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode.SAFE_REGEN && other != null && !other.isRemoved()
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+ && Objects.equals(other.getEncodeId(), entity.getEncodeId())
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+ && entity.getBukkitEntity().getLocation().distance(other.getBukkitEntity().getLocation()) < level.paperConfig().entities.spawning.duplicateUuid.safeRegenDeleteRange
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+ ) {
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+ if (ServerLevel.DEBUG_ENTITIES) LOGGER.warn("[DUPE-UUID] Duplicate UUID found used by " + other + ", deleted entity " + entity + " because it was near the duplicate and likely an actual duplicate. See https://github.com/PaperMC/Paper/issues/1223 for discussion on what this is about.");
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+ entity.discard();
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+ return true;
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+ }
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+ if (other != null && !other.isRemoved()) {
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+ switch (mode) {
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+ case SAFE_REGEN: {
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+ entity.setUUID(java.util.UUID.randomUUID());
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+ if (ServerLevel.DEBUG_ENTITIES) LOGGER.warn("[DUPE-UUID] Duplicate UUID found used by " + other + ", regenerated UUID for " + entity + ". See https://github.com/PaperMC/Paper/issues/1223 for discussion on what this is about.");
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+ break;
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+ }
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+ case DELETE: {
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+ if (ServerLevel.DEBUG_ENTITIES) LOGGER.warn("[DUPE-UUID] Duplicate UUID found used by " + other + ", deleted entity " + entity + ". See https://github.com/PaperMC/Paper/issues/1223 for discussion on what this is about.");
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+ entity.discard();
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+ return true;
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+ }
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+ default:
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+ if (ServerLevel.DEBUG_ENTITIES) LOGGER.warn("[DUPE-UUID] Duplicate UUID found used by " + other + ", doing nothing to " + entity + ". See https://github.com/PaperMC/Paper/issues/1223 for discussion on what this is about.");
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+ break;
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+ }
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+ }
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+ return false;
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+ }
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+ // Paper end
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public CompletableFuture<Either<LevelChunk, ChunkHolder.ChunkLoadingFailure>> prepareTickingChunk(ChunkHolder holder) {
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throw new UnsupportedOperationException(); // Paper - rewrite chunk system
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}
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