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Paper/Spigot-Server-Patches/0299-Duplicate-UUID-Resolve-Option.patch
Aikar e07e0cb3ca
Improve Light Queue and force enable it for all 
There is no reason for the light queue to even be an option. This
enables the light queue for everyone.

This also improves the "can we still tick" time logic to always
check before running a light operation.

previously, we always executed at least 10 on the first world
(but not other worlds...), but we are seeing light take up some
heavy time, so improving that for now.

I've now also improved recheck gaps logic to happen at the end of all single block updates

This also prevents multiple gap checks, as previously if a tick skipped
the gaps check, the next tick would end up re-adding the entry again,
resulting in multiple gap checks.

This now just sets a marker "We need to recheck gaps" and will only occur
once.

This also should reduce chunk loads, as previously, we checked if
the neighbor chunks were loaded for the gap check, however those
neighbor chunks might of unloaded before the light queue operation
actually ran. Now, the neighbor chunk is done when the gap check
is being done, so it should avoid loading chunks.

Fixes #1466
Fixes #1431
2018-09-22 12:09:12 -04:00

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From c6da84012c3f0a1403467ae6f87959436d5906cb Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 21 Jul 2018 14:27:34 -0400
Subject: [PATCH] Duplicate UUID Resolve Option
Due to a bug in https://github.com/PaperMC/Paper/commit/2e29af3df05ec0a383f48be549d1c03200756d24
which was added all the way back in March of 2016, it was unknown (potentially not at the time)
that an entity might actually change the seed of the random object.
At some point, EntitySquid did start setting the seed. Due to this shared random, this caused
every entity to use a Random object with a predictable seed.
This has caused entities to potentially generate with the same UUID....
Over the years, servers have had entities disappear, but no sign of trouble
because CraftBukkit removed the log lines indicating that something was wrong.
We have fixed the root issue causing duplicate UUID's, however we now have chunk
files full of entities that have the same UUID as another entity!
When these chunks load, the 2nd entity will not be added to the world correctly.
If that chunk loads in a different order in the future, then it will reverse and the
missing one is now the one added to the world and not the other. This results in very
inconsistent entity behavior.
This change allows you to recover any duplicate entity by generating a new UUID for it.
This also lets you delete them instead if you don't want to risk having new entities added to
the world that you previously did not see.
But for those who are ok with leaving this inconsistent behavior, you may use WARN or NOTHING options.
It is recommended you regenerate the entities, as these were legit entities, and deserve your love.
diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 01670da006..6a3d92e742 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -433,4 +433,47 @@ public class PaperWorldConfig {
log("Bed Search Radius: " + bedSearchRadius);
}
}
+
+ public enum DuplicateUUIDMode {
+ SAFE_REGEN, REGEN, DELETE, NOTHING, WARN
+ }
+ public DuplicateUUIDMode duplicateUUIDMode = DuplicateUUIDMode.SAFE_REGEN;
+ public int duplicateUUIDDeleteRange = 32;
+ private void repairDuplicateUUID() {
+ String desiredMode = getString("duplicate-uuid-resolver", "saferegen").toLowerCase().trim();
+ duplicateUUIDDeleteRange = getInt("duplicate-uuid-saferegen-delete-range", duplicateUUIDDeleteRange);
+ switch (desiredMode.toLowerCase()) {
+ case "saferegen":
+ case "saferegenerate":
+ duplicateUUIDMode = DuplicateUUIDMode.SAFE_REGEN;
+ log("Duplicate UUID Resolve: Safer Regenerate New UUID (Delete likely duplicates within " + duplicateUUIDDeleteRange + " blocks)");
+ break;
+ case "regen":
+ case "regenerate":
+ duplicateUUIDMode = DuplicateUUIDMode.REGEN;
+ log("Duplicate UUID Resolve: Regenerate New UUID");
+ break;
+ case "remove":
+ case "delete":
+ duplicateUUIDMode = DuplicateUUIDMode.DELETE;
+ log("Duplicate UUID Resolve: Delete Entity");
+ break;
+ case "silent":
+ case "nothing":
+ duplicateUUIDMode = DuplicateUUIDMode.NOTHING;
+ logError("Duplicate UUID Resolve: Do Nothing (no logs) - Warning, may lose indication of bad things happening");
+ logError("PaperMC Strongly discourages use of this setting! Triggering these messages means SOMETHING IS WRONG!");
+ break;
+ case "log":
+ case "warn":
+ duplicateUUIDMode = DuplicateUUIDMode.WARN;
+ log("Duplicate UUID Resolve: Warn (do nothing but log it happened, may be spammy)");
+ break;
+ default:
+ duplicateUUIDMode = DuplicateUUIDMode.WARN;
+ logError("Warning: Invalidate duplicate-uuid-resolver config " + desiredMode + " - must be one of: regen, delete, nothing, warn");
+ log("Duplicate UUID Resolve: Warn (do nothing but log it happened, may be spammy)");
+ break;
+ }
+ }
}
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 0dab65c870..91049ed20f 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -1,5 +1,10 @@
package net.minecraft.server;
+// Paper start
+import com.destroystokyo.paper.PaperWorldConfig.DuplicateUUIDMode;
+import java.util.HashMap;
+import java.util.UUID;
+// Paper end
import com.destroystokyo.paper.exception.ServerInternalException;
import com.google.common.collect.Maps;
import com.google.common.collect.Queues;
@@ -38,6 +43,7 @@ public class Chunk implements IChunkAccess {
public final World world;
public final Map<HeightMap.Type, HeightMap> heightMap;
public Long scheduledForUnload; // Paper - delay chunk unloads
+ private static final Logger logger = LogManager.getLogger(); // Paper
public final int locX;
public final int locZ;
private boolean l; public boolean needsGapCheck() { return l; } // Paper - OBFHELPER
@@ -687,6 +693,7 @@ public class Chunk implements IChunkAccess {
if (i != this.locX || j != this.locZ) {
Chunk.d.warn("Wrong location! ({}, {}) should be ({}, {}), {}", Integer.valueOf(i), Integer.valueOf(j), Integer.valueOf(this.locX), Integer.valueOf(this.locZ), entity);
entity.die();
+ return; // Paper
}
int k = MathHelper.floor(entity.locY / 16.0D);
@@ -863,6 +870,51 @@ public class Chunk implements IChunkAccess {
for (int j = 0; j < i; ++j) {
List entityslice = aentityslice[j]; // Spigot
+ // Paper start
+ DuplicateUUIDMode mode = world.paperConfig.duplicateUUIDMode;
+ if (mode == DuplicateUUIDMode.WARN || mode == DuplicateUUIDMode.DELETE || mode == DuplicateUUIDMode.REGEN || mode == DuplicateUUIDMode.SAFE_REGEN) {
+ Map<UUID, Entity> thisChunk = new HashMap<>();
+ for (Iterator<Entity> iterator = ((List<Entity>) entityslice).iterator(); iterator.hasNext(); ) {
+ Entity entity = iterator.next();
+ if (entity.dead || entity.valid) continue;
+ Entity other = ((WorldServer) world).entitiesByUUID.get(entity.uniqueID);
+ if (other == null || other.dead || world.getEntityUnloadQueue().contains(other)) {
+ other = thisChunk.get(entity.uniqueID);
+ }
+
+ if (mode == DuplicateUUIDMode.SAFE_REGEN && other != null && !other.dead &&
+ !world.getEntityUnloadQueue().contains(other)
+ && java.util.Objects.equals(other.getSaveID(), entity.getSaveID())
+ && entity.getBukkitEntity().getLocation().distance(other.getBukkitEntity().getLocation()) < world.paperConfig.duplicateUUIDDeleteRange
+ ) {
+ 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.");
+ entity.die();
+ iterator.remove();
+ continue;
+ }
+ if (other != null && !other.dead) {
+ switch (mode) {
+ case SAFE_REGEN:
+ case REGEN: {
+ entity.setUUID(UUID.randomUUID());
+ 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.");
+ break;
+ }
+ case DELETE: {
+ 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.");
+ entity.die();
+ iterator.remove();
+ break;
+ }
+ default:
+ 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.");
+ break;
+ }
+ }
+ thisChunk.put(entity.uniqueID, entity);
+ }
+ }
+ // Paper end
this.world.a(entityslice.stream().filter((entity) -> {
return !(entity instanceof EntityHuman);
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 7d8f723968..46399cc9b0 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -2719,6 +2719,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
});
}
+ public void setUUID(UUID uuid) { a(uuid); } // Paper - OBFHELPER
public void a(UUID uuid) {
this.uniqueID = uuid;
this.au = this.uniqueID.toString();
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index ee2cdb897c..956eabd7dc 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -75,7 +75,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
}
};
// Spigot end
- protected final Set<Entity> g = com.google.common.collect.Sets.newHashSet(); // Paper
+ protected final Set<Entity> g = com.google.common.collect.Sets.newHashSet(); public Set<Entity> getEntityUnloadQueue() { return g; };// Paper - OBFHELPER
//public final List<TileEntity> tileEntityList = Lists.newArrayList(); // Paper - remove unused list
public final List<TileEntity> tileEntityListTick = Lists.newArrayList();
private final List<TileEntity> c = Lists.newArrayList();
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index 709f3e525c..2692d0a1b6 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -41,7 +41,7 @@ public class WorldServer extends World implements IAsyncTaskHandler {
private final MinecraftServer server;
public EntityTracker tracker;
private final PlayerChunkMap manager;
- private final Map<UUID, Entity> entitiesByUUID = Maps.newHashMap();
+ public final Map<UUID, Entity> entitiesByUUID = Maps.newHashMap(); // Paper
public boolean savingDisabled;
private boolean J;
private int emptyTime;
@@ -991,14 +991,17 @@ public class WorldServer extends World implements IAsyncTaskHandler {
this.g.remove(entity1);
} else {
if (!(entity instanceof EntityHuman)) {
- WorldServer.a.error("Keeping entity {} that already exists with UUID {}", entity1, uuid.toString()); // CraftBukkit // Paper
- WorldServer.a.error("Deleting duplicate entity {}", entity); // Paper
- if (DEBUG_ENTITIES) {
- if (entity1.addedToWorldStack != null) {
- entity1.addedToWorldStack.printStackTrace();
+ if (entity.world.paperConfig.duplicateUUIDMode != com.destroystokyo.paper.PaperWorldConfig.DuplicateUUIDMode.NOTHING) {
+ WorldServer.a.error("Keeping entity {} that already exists with UUID {}", entity1, uuid.toString()); // CraftBukkit // Paper
+ WorldServer.a.error("Duplicate entity {} will not be added to the world. See paper.yml duplicate-uuid-resolver and set this to either regen, delete or nothing to get rid of this message", entity); // Paper
+ if (DEBUG_ENTITIES) {
+ if (entity1.addedToWorldStack != null) {
+ entity1.addedToWorldStack.printStackTrace();
+ }
+ getAddToWorldStackTrace(entity).printStackTrace();
}
- getAddToWorldStackTrace(entity).printStackTrace();
}
+
return false;
}
@@ -1021,7 +1024,7 @@ public class WorldServer extends World implements IAsyncTaskHandler {
}
Entity old = this.entitiesByUUID.put(entity.getUniqueID(), entity);
- if (old != null && old.getId() != entity.getId() && old.valid) {
+ if (old != null && old.getId() != entity.getId() && old.valid && entity.world.paperConfig.duplicateUUIDMode != com.destroystokyo.paper.PaperWorldConfig.DuplicateUUIDMode.NOTHING) {
Logger logger = LogManager.getLogger();
logger.error("Overwrote an existing entity " + old + " with " + entity);
if (DEBUG_ENTITIES) {
--
2.19.0
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