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38dc3b25d8
When per-player mob spawning is enabled we do not need to randomly shuffle the chunk list. Additionally, we can use the NearbyPlayers class to quickly retrieve nearby players instead of possible searching all players on the server.
120 lines
7.0 KiB
Diff
120 lines
7.0 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/io/papermc/paper/chunk/system/ChunkSystem.java b/src/main/java/io/papermc/paper/chunk/system/ChunkSystem.java
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index cbeaadaecf816070b3a37938c8e683180939afc4..95e5073a68e4dd38b70e8268daf2160922c3a12f 100644
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--- a/src/main/java/io/papermc/paper/chunk/system/ChunkSystem.java
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+++ b/src/main/java/io/papermc/paper/chunk/system/ChunkSystem.java
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@@ -74,7 +74,17 @@ 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 5b7260b5a14cb9d2b90cf3c411d119e6bfa84046..0b1aadd3648f46680e4edc137de3e5ce52428383 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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@@ -534,6 +534,7 @@ 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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}), position); // Paper - rewrite chunk system
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// CraftBukkit end
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@@ -545,6 +546,49 @@ 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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