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Leaf/leaf-server/minecraft-patches/features/0085-Multithreaded-Tracker.patch
Dreeam a56de1a3b0 [ci skip] cleanup 
stage 2
2025-05-15 21:56:01 -04:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: peaches94 <peachescu94@gmail.com>
Date: Sat, 2 Jul 2022 00:35:56 -0500
Subject: [PATCH] Multithreaded Tracker
Original license: GPL v3
Original project: https://github.com/Bloom-host/Petal
Original license: GPL v3
Original project: https://github.com/TECHNOVE/Airplane-Experimental
Co-authored-by: Paul Sauve <paul@technove.co>
Co-authored-by: Kevin Raneri <kevin.raneri@gmail.com>
Co-authored-by: HaHaWTH <102713261+HaHaWTH@users.noreply.github.com>
This patch refactored from original multithreaded tracker (Petal version),
and is derived from the Airplane fork by Paul Sauve, the tree is like:
Airplane -> Pufferfish? -> Petal -> Leaf
We made much of tracking logic asynchronously, and fixed visible issue
for the case of some NPC plugins which using real entity type, e.g. Citizens.
But it is still recommending to use those packet based, virtual entity
based NPC plugins, e.g. ZNPC Plus, Adyeshach, Fancy NPC, etc.
diff --git a/ca/spottedleaf/moonrise/patches/chunk_system/player/RegionizedPlayerChunkLoader.java b/ca/spottedleaf/moonrise/patches/chunk_system/player/RegionizedPlayerChunkLoader.java
index dd2509996bfd08e8c3f9f2be042229eac6d7692d..a35e9fae8f8da0c42f0616c4f78dc396492673aa 100644
--- a/ca/spottedleaf/moonrise/patches/chunk_system/player/RegionizedPlayerChunkLoader.java
+++ b/ca/spottedleaf/moonrise/patches/chunk_system/player/RegionizedPlayerChunkLoader.java
@@ -342,7 +342,7 @@ public final class RegionizedPlayerChunkLoader {
private boolean canGenerateChunks = true;
private final ArrayDeque<ChunkHolderManager.TicketOperation<?, ?>> delayedTicketOps = new ArrayDeque<>();
- private final LongOpenHashSet sentChunks = new LongOpenHashSet();
+ private final LongOpenHashSet sentChunks = org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled && !org.dreeam.leaf.config.modules.async.MultithreadedTracker.compatModeEnabled ? new org.dreeam.leaf.util.map.ConcurrentLongHashSet() : new LongOpenHashSet(); // Leaf - Multithreaded tracker
private static final byte CHUNK_TICKET_STAGE_NONE = 0;
private static final byte CHUNK_TICKET_STAGE_LOADING = 1;
diff --git a/net/minecraft/server/level/ChunkMap.java b/net/minecraft/server/level/ChunkMap.java
index 5d9d233e3a568aa6297ed9c703fa450f98158602..4984e57d3b0806164111e79acfc82f6d9b27bfbf 100644
--- a/net/minecraft/server/level/ChunkMap.java
+++ b/net/minecraft/server/level/ChunkMap.java
@@ -248,6 +248,15 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
final ServerPlayer[] backingSet = inRange.getRawDataUnchecked();
+ // Leaf start - Multithreaded tracker
+ if (org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled)
+ for (int i = 0, len = inRange.size(); i < len; i++) {
+ final ServerPlayer player = backingSet[i];
+ if (player == null) continue;
+ ++(player.mobCounts[index]);
+ }
+ else
+ // Leaf end - Multithreaded tracker
for (int i = 0, len = inRange.size(); i < len; i++) {
++(backingSet[i].mobCounts[index]);
}
@@ -951,6 +960,13 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
// Paper end - optimise entity tracker
protected void tick() {
+ // Leaf start - Multithreaded tracker
+ if (org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled) {
+ final ca.spottedleaf.moonrise.patches.chunk_system.level.ChunkSystemServerLevel level = this.level;
+ org.dreeam.leaf.async.tracker.MultithreadedTracker.tick(level);
+ return;
+ }
+ // Leaf end - Multithreaded tracker
// Paper start - optimise entity tracker
if (true) {
this.newTrackerTick();
@@ -1073,11 +1089,12 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
final Entity entity;
private final int range;
SectionPos lastSectionPos;
- public final Set<ServerPlayerConnection> seenBy = new it.unimi.dsi.fastutil.objects.ReferenceOpenHashSet<>(); // Paper - Perf: optimise map impl
+ public final Set<ServerPlayerConnection> seenBy = org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled ? com.google.common.collect.Sets.newConcurrentHashSet() : new it.unimi.dsi.fastutil.objects.ReferenceOpenHashSet<>(); // Paper - Perf: optimise map impl // Leaf - petal - Multithreaded tracker
// Paper start - optimise entity tracker
private long lastChunkUpdate = -1L;
private ca.spottedleaf.moonrise.common.misc.NearbyPlayers.TrackedChunk lastTrackedChunk;
+ public final Object sync = new Object(); // Leaf - Multithreaded tracker
@Override
public final void moonrise$tick(final ca.spottedleaf.moonrise.common.misc.NearbyPlayers.TrackedChunk chunk) {
@@ -1100,8 +1117,41 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
this.lastTrackedChunk = chunk;
final ServerPlayer[] playersRaw = players.getRawDataUnchecked();
+ // Leaf start - Multithreaded tracker
+ final int playersLen = players.size(); // Ensure length won't change in the future tasks
+
+ if (org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled && org.dreeam.leaf.config.modules.async.MultithreadedTracker.compatModeEnabled) {
+ final boolean isServerPlayer = this.entity instanceof ServerPlayer;
+ final boolean isRealPlayer = isServerPlayer && ((ca.spottedleaf.moonrise.patches.chunk_system.player.ChunkSystemServerPlayer) this.entity).moonrise$isRealPlayer();
+ Runnable updatePlayerTasks = () -> {
+ for (int i = 0; i < playersLen; ++i) {
+ final ServerPlayer player = playersRaw[i];
+ this.updatePlayer(player);
+ }
- for (int i = 0, len = players.size(); i < len; ++i) {
+ if (lastChunkUpdate != currChunkUpdate || lastTrackedChunk != chunk) {
+ // need to purge any players possible not in the chunk list
+ for (final ServerPlayerConnection conn : new java.util.ArrayList<>(this.seenBy)) {
+ final ServerPlayer player = conn.getPlayer();
+ if (!players.contains(player)) {
+ this.removePlayer(player);
+ }
+ }
+ }
+ };
+
+ // Only update asynchronously for real player, and sync update for fake players
+ // This can fix compatibility issue with NPC plugins using real entity type, like Citizens
+ // To prevent visible issue with player type NPCs
+ // btw, still recommend to use packet based NPC plugins, like ZNPC Plus, Adyeshach, Fancy NPC, etc.
+ if (isRealPlayer || !isServerPlayer) {
+ org.dreeam.leaf.async.tracker.MultithreadedTracker.getTrackerExecutor().execute(updatePlayerTasks);
+ } else {
+ updatePlayerTasks.run();
+ }
+ } else {
+ final int playersLength = Math.min(playersRaw.length, players.size());
+ for (int i = 0; i < playersLength; ++i) {
final ServerPlayer player = playersRaw[i];
this.updatePlayer(player);
}
@@ -1115,6 +1165,8 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
}
}
+ }
+ // Leaf end - Multithreaded tracker
}
@Override
@@ -1176,7 +1228,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
public void broadcast(Packet<?> packet) {
- for (ServerPlayerConnection serverPlayerConnection : this.seenBy) {
+ for (ServerPlayerConnection serverPlayerConnection : this.seenBy.toArray(new ServerPlayerConnection[0])) {// Leaf - petal - Multithreaded tracker
serverPlayerConnection.send(packet);
}
}
@@ -1189,21 +1241,22 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
public void broadcastRemoved() {
- for (ServerPlayerConnection serverPlayerConnection : this.seenBy) {
+ for (ServerPlayerConnection serverPlayerConnection : this.seenBy.toArray(new ServerPlayerConnection[0])) {// Leaf - petal - Multithreaded tracker
this.serverEntity.removePairing(serverPlayerConnection.getPlayer());
}
}
public void removePlayer(ServerPlayer player) {
- org.spigotmc.AsyncCatcher.catchOp("player tracker clear"); // Spigot
+ //org.spigotmc.AsyncCatcher.catchOp("player tracker clear"); // Spigot // Leaf - petal - Multithreaded tracker - We can remove async too
if (this.seenBy.remove(player.connection)) {
this.serverEntity.removePairing(player);
}
}
public void updatePlayer(ServerPlayer player) {
- org.spigotmc.AsyncCatcher.catchOp("player tracker update"); // Spigot
+ //org.spigotmc.AsyncCatcher.catchOp("player tracker update"); // Spigot // Leaf - petal - Multithreaded tracker - We can update async
if (player != this.entity) {
+ if (org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled && player == null) return; // Leaf - Multithreaded tracker
// Paper start - remove allocation of Vec3D here
// Vec3 vec3 = player.position().subtract(this.entity.position());
double vec3_dx = player.getX() - this.entity.getX();
diff --git a/net/minecraft/server/level/ServerBossEvent.java b/net/minecraft/server/level/ServerBossEvent.java
index f106373ef3ac4a8685c2939c9e8361688a285913..51ae390c68e7a3aa193329cc3bc47ca675930ff2 100644
--- a/net/minecraft/server/level/ServerBossEvent.java
+++ b/net/minecraft/server/level/ServerBossEvent.java
@@ -13,7 +13,7 @@ import net.minecraft.util.Mth;
import net.minecraft.world.BossEvent;
public class ServerBossEvent extends BossEvent {
- private final Set<ServerPlayer> players = Sets.newHashSet();
+ private final Set<ServerPlayer> players = org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled ? Sets.newConcurrentHashSet() : Sets.newHashSet(); // Leaf - petal - Multithreaded tracker - players can be removed in async tracking
private final Set<ServerPlayer> unmodifiablePlayers = Collections.unmodifiableSet(this.players);
public boolean visible = true;
diff --git a/net/minecraft/server/level/ServerEntity.java b/net/minecraft/server/level/ServerEntity.java
index d8298c7925e3bcea07ead4d438478cc51abcfa16..be3057119bcbce4a4f72284fa7ba8f60ba43f397 100644
--- a/net/minecraft/server/level/ServerEntity.java
+++ b/net/minecraft/server/level/ServerEntity.java
@@ -110,8 +110,16 @@ public class ServerEntity {
.forEach(
removedPassenger -> {
if (removedPassenger instanceof ServerPlayer serverPlayer1) {
- serverPlayer1.connection
- .teleport(serverPlayer1.getX(), serverPlayer1.getY(), serverPlayer1.getZ(), serverPlayer1.getYRot(), serverPlayer1.getXRot());
+ // Leaf start - Multithreaded tracker - Ensure teleport is executed on server thread
+ if (org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled && Thread.currentThread() instanceof org.dreeam.leaf.async.tracker.MultithreadedTracker.MultithreadedTrackerThread) {
+ net.minecraft.server.MinecraftServer.getServer().scheduleOnMain(() -> serverPlayer1.connection
+ .teleport(serverPlayer1.getX(), serverPlayer1.getY(), serverPlayer1.getZ(), serverPlayer1.getYRot(), serverPlayer1.getXRot())
+ );
+ } else {
+ serverPlayer1.connection
+ .teleport(serverPlayer1.getX(), serverPlayer1.getY(), serverPlayer1.getZ(), serverPlayer1.getYRot(), serverPlayer1.getXRot());
+ }
+ // Leaf end - Multithreaded tracker - Ensure teleport is executed on server thread
}
}
);
@@ -434,16 +442,33 @@ public class ServerEntity {
if (this.entity instanceof LivingEntity) {
Set<AttributeInstance> attributesToSync = ((LivingEntity)this.entity).getAttributes().getAttributesToSync();
+ // Leaf start - Multithreaded tracker
+ if (org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled) {
+ synchronized (attributesToSync) {
+ if (!attributesToSync.isEmpty()) {
+ // CraftBukkit start - Send scaled max health
+ if (this.entity instanceof ServerPlayer serverPlayer) {
+ serverPlayer.getBukkitEntity().injectScaledMaxHealth(attributesToSync, false);
+ }
+ // CraftBukkit end
+ this.broadcastAndSend(new ClientboundUpdateAttributesPacket(this.entity.getId(), attributesToSync));
+ }
+
+ attributesToSync.clear();
+ }
+ } else {
if (!attributesToSync.isEmpty()) {
// CraftBukkit start - Send scaled max health
if (this.entity instanceof ServerPlayer serverPlayer) {
- serverPlayer.getBukkitEntity().injectScaledMaxHealth(attributesToSync, false);
+ serverPlayer.getBukkitEntity().injectScaledMaxHealth(attributesToSync, false); // Leaf - Multithreaded tracker - diff on change
}
// CraftBukkit end
this.broadcastAndSend(new ClientboundUpdateAttributesPacket(this.entity.getId(), attributesToSync));
}
attributesToSync.clear();
+ }
+ // Leaf end - Multithreaded tracker
}
}
diff --git a/net/minecraft/server/level/ServerLevel.java b/net/minecraft/server/level/ServerLevel.java
index 275b640f4536366152f59acf071dd4eba15696c8..a669a59a42f814480879a52d2da5e04c636720de 100644
--- a/net/minecraft/server/level/ServerLevel.java
+++ b/net/minecraft/server/level/ServerLevel.java
@@ -2522,7 +2522,7 @@ public class ServerLevel extends Level implements ServerEntityGetter, WorldGenLe
@Override
public LevelEntityGetter<Entity> getEntities() {
- org.spigotmc.AsyncCatcher.catchOp("Chunk getEntities call"); // Spigot
+ //org.spigotmc.AsyncCatcher.catchOp("Chunk getEntities call"); // Spigot // Leaf - Multithreaded tracker
return this.moonrise$getEntityLookup(); // Paper - rewrite chunk system
}
@@ -2754,7 +2754,7 @@ public class ServerLevel extends Level implements ServerEntityGetter, WorldGenLe
}
map.carriedByPlayers.remove(player);
- if (map.carriedBy.removeIf(holdingPlayer -> holdingPlayer.player == player)) {
+ if (map.carriedBy.removeIf(holdingPlayer -> holdingPlayer != null && holdingPlayer.player == player)) { // Leaf - Multithreaded tracker
map.decorations.remove(player.getName().getString());
}
}
diff --git a/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 04bf8bba0d8c0d5459605253dcc3f135bf43fd95..abe79d07196de0a10a382d4c37161c7eb4a604ae 100644
--- a/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -1819,7 +1819,7 @@ public class ServerGamePacketListenerImpl
}
public void internalTeleport(PositionMoveRotation posMoveRotation, Set<Relative> relatives) {
- org.spigotmc.AsyncCatcher.catchOp("teleport"); // Paper
+ //org.spigotmc.AsyncCatcher.catchOp("teleport"); // Paper // Leaf - Multithreaded tracker
// Paper start - Prevent teleporting dead entities
if (this.player.isRemoved()) {
LOGGER.info("Attempt to teleport removed player {} restricted", player.getScoreboardName());
diff --git a/net/minecraft/world/entity/ai/attributes/AttributeInstance.java b/net/minecraft/world/entity/ai/attributes/AttributeInstance.java
index 8013594bb4844e7a8abf28123958e7f632d39341..80c703fe85ec21e4d218823504f4bbf7826b2fa6 100644
--- a/net/minecraft/world/entity/ai/attributes/AttributeInstance.java
+++ b/net/minecraft/world/entity/ai/attributes/AttributeInstance.java
@@ -24,8 +24,11 @@ public class AttributeInstance {
private final Map<AttributeModifier.Operation, Map<ResourceLocation, AttributeModifier>> modifiersByOperation = Maps.newEnumMap(
AttributeModifier.Operation.class
);
- private final Map<ResourceLocation, AttributeModifier> modifierById = new Object2ObjectArrayMap<>();
- private final Map<ResourceLocation, AttributeModifier> permanentModifiers = new Object2ObjectArrayMap<>();
+ // Leaf start - Multithreaded tracker
+ private final boolean multiThreadedTrackingEnabled = org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled;
+ private final Map<ResourceLocation, AttributeModifier> modifierById = multiThreadedTrackingEnabled ? it.unimi.dsi.fastutil.objects.Object2ObjectMaps.synchronize(new Object2ObjectArrayMap<>(), this) : new Object2ObjectArrayMap<>();
+ private final Map<ResourceLocation, AttributeModifier> permanentModifiers = multiThreadedTrackingEnabled ? it.unimi.dsi.fastutil.objects.Object2ObjectMaps.synchronize(new Object2ObjectArrayMap<>(), this) : new Object2ObjectArrayMap<>();
+ // Leaf end - Multithreaded tracker
private double baseValue;
private boolean dirty = true;
private double cachedValue;
@@ -114,7 +117,15 @@ public class AttributeInstance {
}
protected void setDirty() {
- this.dirty = true;
+ // Leaf start - Multithreaded tracker
+ if (multiThreadedTrackingEnabled) {
+ synchronized (this) {
+ this.dirty = true;
+ }
+ } else {
+ this.dirty = true;
+ }
+ // Leaf end - Multithreaded tracker
this.onDirty.accept(this);
}
@@ -141,6 +152,17 @@ public class AttributeInstance {
}
public double getValue() {
+ // Leaf start - Multithreaded tracker
+ if (multiThreadedTrackingEnabled) {
+ synchronized (this) {
+ if (this.dirty) {
+ this.cachedValue = this.calculateValue();
+ this.dirty = false;
+ }
+ return this.cachedValue;
+ }
+ }
+ // Leaf end - Multithreaded tracker
if (this.dirty) {
this.cachedValue = this.calculateValue();
this.dirty = false;
diff --git a/net/minecraft/world/entity/ai/attributes/AttributeMap.java b/net/minecraft/world/entity/ai/attributes/AttributeMap.java
index 89f4c5b2d61e27acd48063f9f24ce9ea91898b8b..d6e7685cb0e9beaa017bcc665f0f1c7c29c2ca5f 100644
--- a/net/minecraft/world/entity/ai/attributes/AttributeMap.java
+++ b/net/minecraft/world/entity/ai/attributes/AttributeMap.java
@@ -19,11 +19,11 @@ import org.slf4j.Logger;
public class AttributeMap {
private static final Logger LOGGER = LogUtils.getLogger();
- // Gale start - Lithium - replace AI attributes with optimized collections
- private final Map<Holder<Attribute>, AttributeInstance> attributes = new it.unimi.dsi.fastutil.objects.Reference2ReferenceOpenHashMap<>(0);
- private final Set<AttributeInstance> attributesToSync = new it.unimi.dsi.fastutil.objects.ReferenceOpenHashSet<>(0);
- private final Set<AttributeInstance> attributesToUpdate = new it.unimi.dsi.fastutil.objects.ReferenceOpenHashSet<>(0);
- // Gale end - Lithium - replace AI attributes with optimized collections
+ // Leaf start - Multithreaded tracker
+ private final Map<Holder<Attribute>, AttributeInstance> attributes;
+ private final Set<AttributeInstance> attributesToSync;
+ private final Set<AttributeInstance> attributesToUpdate;
+ // Leaf end - Multithreaded tracker
private final AttributeSupplier supplier;
private final java.util.function.Function<Holder<Attribute>, AttributeInstance> createInstance; // Gale - Airplane - reduce entity allocations
private final net.minecraft.world.entity.LivingEntity entity; // Purpur - Ridables
@@ -37,6 +37,17 @@ public class AttributeMap {
// Purpur end - Ridables
this.supplier = defaultAttributes;
this.createInstance = holder -> this.supplier.createInstance(this::onAttributeModified, holder); // Gale - Airplane - reduce entity allocations
+ // Leaf start - Multithreaded tracker
+ if (org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled) {
+ this.attributes = it.unimi.dsi.fastutil.objects.Reference2ReferenceMaps.synchronize(new it.unimi.dsi.fastutil.objects.Reference2ReferenceOpenHashMap<>(0));
+ this.attributesToSync = it.unimi.dsi.fastutil.objects.ReferenceSets.synchronize(new it.unimi.dsi.fastutil.objects.ReferenceArraySet<>(0));
+ this.attributesToUpdate = it.unimi.dsi.fastutil.objects.ReferenceSets.synchronize(new it.unimi.dsi.fastutil.objects.ReferenceArraySet<>(0));
+ } else {
+ this.attributes = new it.unimi.dsi.fastutil.objects.Reference2ReferenceOpenHashMap<>(0);
+ this.attributesToSync = new it.unimi.dsi.fastutil.objects.ReferenceArraySet<>(0);
+ this.attributesToUpdate = new it.unimi.dsi.fastutil.objects.ReferenceArraySet<>(0);
+ }
+ // Leaf end - Multithreaded tracker
}
private void onAttributeModified(AttributeInstance instance) {
diff --git a/net/minecraft/world/entity/vehicle/NewMinecartBehavior.java b/net/minecraft/world/entity/vehicle/NewMinecartBehavior.java
index 724466d14c925704671e510cea1919ee95a2ae02..4426b344677ab9f2753dd2d219921bcb7cf39980 100644
--- a/net/minecraft/world/entity/vehicle/NewMinecartBehavior.java
+++ b/net/minecraft/world/entity/vehicle/NewMinecartBehavior.java
@@ -35,13 +35,20 @@ public class NewMinecartBehavior extends MinecartBehavior {
private int cachedLerpDelay;
private float cachedPartialTick;
private int lerpDelay = 0;
- public final List<NewMinecartBehavior.MinecartStep> lerpSteps = new LinkedList<>();
+ public final List<NewMinecartBehavior.MinecartStep> lerpSteps; // Leaf - Multithreaded tracker
public final List<NewMinecartBehavior.MinecartStep> currentLerpSteps = new LinkedList<>();
public double currentLerpStepsTotalWeight = 0.0;
public NewMinecartBehavior.MinecartStep oldLerp = NewMinecartBehavior.MinecartStep.ZERO;
public NewMinecartBehavior(AbstractMinecart minecart) {
super(minecart);
+ // Leaf start - Multithreaded tracker
+ if (org.dreeam.leaf.config.modules.async.MultithreadedTracker.enabled) {
+ lerpSteps = it.unimi.dsi.fastutil.objects.ObjectLists.synchronize(new it.unimi.dsi.fastutil.objects.ObjectArrayList<>());
+ } else {
+ lerpSteps = new it.unimi.dsi.fastutil.objects.ObjectArrayList<>();
+ }
+ // Leaf end - Multithreaded tracker
}
@Override
diff --git a/net/minecraft/world/level/saveddata/maps/MapItemSavedData.java b/net/minecraft/world/level/saveddata/maps/MapItemSavedData.java
index 681dec447486138088fe5f705ef4fadab531139f..27f8a22d798a17dbd5949d1b6ff0526837fe91d5 100644
--- a/net/minecraft/world/level/saveddata/maps/MapItemSavedData.java
+++ b/net/minecraft/world/level/saveddata/maps/MapItemSavedData.java
@@ -279,6 +279,7 @@ public class MapItemSavedData extends SavedData {
for (int i = 0; i < this.carriedBy.size(); i++) {
MapItemSavedData.HoldingPlayer holdingPlayer1 = this.carriedBy.get(i);
+ if (holdingPlayer1 == null) continue; // Leaf - Multithreaded tracker
Player player1 = holdingPlayer1.player;
String string = player1.getName().getString();
if (!player1.isRemoved() && (player1.getInventory().contains(predicate) || mapStack.isFramed())) {
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