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da9d110d5b
This patch does not appear to be doing anything useful, and may hide errors. Currently, the save logic does not run through this path either so it did not do anything. Additionally, properly implement support for handling RegionFileSizeException in Moonrise.
90 lines
4.5 KiB
Diff
90 lines
4.5 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/world/level/chunk/status/ChunkStatusTasks.java b/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatusTasks.java
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index 412caefe776df6c8e931f6a1a48ea2525ec6610e..aff4c3d63a97d5bbde004a616f7e14fca59b5ab9 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatusTasks.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatusTasks.java
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@@ -178,10 +178,51 @@ public class ChunkStatusTasks {
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entity.discard(null); // CraftBukkit - add Bukkit remove cause
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needsRemoval = true;
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}
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+ checkDupeUUID(world, entity); // Paper - duplicate uuid resolving
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return !needsRemoval;
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}));
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// CraftBukkit end
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}
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}
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+
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+ // Paper start - duplicate uuid resolving
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+ // rets true if to prevent the entity from being added
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+ public static boolean checkDupeUUID(ServerLevel level, net.minecraft.world.entity.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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+ net.minecraft.world.entity.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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+ entity.discard(null);
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+ return true;
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+ }
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+ if (!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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+ break;
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+ }
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+ case DELETE: {
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+ entity.discard(org.bukkit.event.entity.EntityRemoveEvent.Cause.DISCARD);
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+ return true;
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+ }
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+ default:
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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 - duplicate uuid resolving
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}
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