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Paper/patches/server/0801-Actually-unload-POI-data.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <spottedleaf@spottedleaf.dev>
Date: Mon, 31 Aug 2020 11:08:17 -0700
Subject: [PATCH] Actually unload POI data
While it's not likely for a poi data leak to be meaningful,
sometimes it is.
This patch also prevents the saving/unloading of POI data when
world saving is disabled.
diff --git a/src/main/java/net/minecraft/server/ChunkSystem.java b/src/main/java/net/minecraft/server/ChunkSystem.java
index 2a099fe0d514f181bf2b452d5333bc29b0d29e43..81ea64443a843736f9ada97900d173c302e39ba0 100644
--- a/src/main/java/net/minecraft/server/ChunkSystem.java
+++ b/src/main/java/net/minecraft/server/ChunkSystem.java
@@ -270,6 +270,7 @@ public final class ChunkSystem {
for (int index = 0, len = chunkMap.regionManagers.size(); index < len; ++index) {
chunkMap.regionManagers.get(index).addChunk(holder.pos.x, holder.pos.z);
}
+ chunkMap.getPoiManager().dequeueUnload(holder.pos.longKey); // Paper - unload POI data
}
public static void onChunkHolderDelete(final ServerLevel level, final ChunkHolder holder) {
@@ -277,6 +278,7 @@ public final class ChunkSystem {
for (int index = 0, len = chunkMap.regionManagers.size(); index < len; ++index) {
chunkMap.regionManagers.get(index).removeChunk(holder.pos.x, holder.pos.z);
}
+ chunkMap.getPoiManager().queueUnload(holder.pos.longKey, MinecraftServer.currentTickLong + 1); // Paper - unload POI data
}
public static void onChunkBorder(LevelChunk chunk, ChunkHolder holder) {
diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index fe10c770b511fa8a38ece2bf9679492a85b28eff..a5e74d30045a171f5ed66a115fbd429e9ab412af 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -1016,7 +1016,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
private void processUnloads(BooleanSupplier shouldKeepTicking) {
LongIterator longiterator = this.toDrop.iterator();
- for (int i = 0; longiterator.hasNext() && (shouldKeepTicking.getAsBoolean() || i < 200 || this.toDrop.size() > 2000); longiterator.remove()) {
+ for (int i = 0; longiterator.hasNext() && (shouldKeepTicking.getAsBoolean() || i < 200 || this.toDrop.size() > 2000); longiterator.remove()) { // Paper - diff on change
long j = longiterator.nextLong();
ChunkHolder playerchunk = this.updatingChunks.queueRemove(j); // Paper - Don't copy
@@ -1164,6 +1164,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
this.poiManager.loadInData(pos, chunkHolder.poiData);
chunkHolder.tasks.forEach(Runnable::run);
+ this.getPoiManager().dequeueUnload(pos.longKey); // Paper
if (chunkHolder.protoChunk != null) {
ProtoChunk protochunk = chunkHolder.protoChunk;
diff --git a/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiManager.java b/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiManager.java
index 497a81e49d54380713c18523ae8f09f94c453721..210b0cdd4831421c8f43c3d823ac8e962b56bbbc 100644
--- a/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiManager.java
+++ b/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiManager.java
@@ -1,5 +1,6 @@
package net.minecraft.world.entity.ai.village.poi;
+import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap; // Paper
import com.mojang.datafixers.DataFixer;
import com.mojang.datafixers.util.Pair;
import it.unimi.dsi.fastutil.longs.Long2ByteMap;
@@ -38,16 +39,145 @@ import net.minecraft.world.level.chunk.storage.SectionStorage;
public class PoiManager extends SectionStorage<PoiSection> {
public static final int MAX_VILLAGE_DISTANCE = 6;
public static final int VILLAGE_SECTION_SIZE = 1;
- private final PoiManager.DistanceTracker distanceTracker;
+ // Paper start - unload poi data
+ // the vanilla tracker needs to be replaced because it does not support level removes
+ private final io.papermc.paper.util.misc.Delayed26WayDistancePropagator3D villageDistanceTracker = new io.papermc.paper.util.misc.Delayed26WayDistancePropagator3D();
+ static final int POI_DATA_SOURCE = 7;
+ public static int convertBetweenLevels(final int level) {
+ return POI_DATA_SOURCE - level;
+ }
+
+ protected void updateDistanceTracking(long section) {
+ if (this.isVillageCenter(section)) {
+ this.villageDistanceTracker.setSource(section, POI_DATA_SOURCE);
+ } else {
+ this.villageDistanceTracker.removeSource(section);
+ }
+ }
+ // Paper end - unload poi data
private final LongSet loadedChunks = new LongOpenHashSet();
public final net.minecraft.server.level.ServerLevel world; // Paper // Paper public
public PoiManager(Path path, DataFixer dataFixer, boolean dsync, RegistryAccess registryManager, LevelHeightAccessor world) {
super(path, PoiSection::codec, PoiSection::new, dataFixer, DataFixTypes.POI_CHUNK, dsync, registryManager, world);
+ if (world == null) { throw new IllegalStateException("world must be non-null"); } // Paper - require non-null
this.world = (net.minecraft.server.level.ServerLevel)world; // Paper
- this.distanceTracker = new PoiManager.DistanceTracker();
}
+ // Paper start - actually unload POI data
+ private final java.util.TreeSet<QueuedUnload> queuedUnloads = new java.util.TreeSet<>();
+ private final Long2ObjectOpenHashMap<QueuedUnload> queuedUnloadsByCoordinate = new Long2ObjectOpenHashMap<>();
+
+ static final class QueuedUnload implements Comparable<QueuedUnload> {
+
+ private final long unloadTick;
+ private final long coordinate;
+
+ public QueuedUnload(long unloadTick, long coordinate) {
+ this.unloadTick = unloadTick;
+ this.coordinate = coordinate;
+ }
+
+ @Override
+ public int compareTo(QueuedUnload other) {
+ if (other.unloadTick == this.unloadTick) {
+ return Long.compare(this.coordinate, other.coordinate);
+ } else {
+ return Long.compare(this.unloadTick, other.unloadTick);
+ }
+ }
+
+ @Override
+ public int hashCode() {
+ int hash = 1;
+ hash = hash * 31 + Long.hashCode(this.unloadTick);
+ hash = hash * 31 + Long.hashCode(this.coordinate);
+ return hash;
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (obj == null || obj.getClass() != QueuedUnload.class) {
+ return false;
+ }
+ QueuedUnload other = (QueuedUnload)obj;
+ return other.unloadTick == this.unloadTick && other.coordinate == this.coordinate;
+ }
+ }
+
+ long determineDelay(long coordinate) {
+ if (this.isEmpty(coordinate)) {
+ return 5 * 60 * 20;
+ } else {
+ return 60 * 20;
+ }
+ }
+
+ public void queueUnload(long coordinate, long minTarget) {
+ io.papermc.paper.util.TickThread.softEnsureTickThread("async poi unload queue");
+ QueuedUnload unload = new QueuedUnload(minTarget + this.determineDelay(coordinate), coordinate);
+ QueuedUnload existing = this.queuedUnloadsByCoordinate.put(coordinate, unload);
+ if (existing != null) {
+ this.queuedUnloads.remove(existing);
+ }
+ this.queuedUnloads.add(unload);
+ }
+
+ public void dequeueUnload(long coordinate) {
+ io.papermc.paper.util.TickThread.softEnsureTickThread("async poi unload dequeue");
+ QueuedUnload unload = this.queuedUnloadsByCoordinate.remove(coordinate);
+ if (unload != null) {
+ this.queuedUnloads.remove(unload);
+ }
+ }
+
+ public void pollUnloads(BooleanSupplier canSleepForTick) {
+ io.papermc.paper.util.TickThread.softEnsureTickThread("async poi unload");
+ long currentTick = net.minecraft.server.MinecraftServer.currentTickLong;
+ net.minecraft.server.level.ServerChunkCache chunkProvider = this.world.getChunkSource();
+ net.minecraft.server.level.ChunkMap playerChunkMap = chunkProvider.chunkMap;
+ // copied target determination from PlayerChunkMap
+
+ java.util.Iterator<QueuedUnload> iterator = this.queuedUnloads.iterator();
+ for (int i = 0; iterator.hasNext() && (i < 200 || this.queuedUnloads.size() > 2000 || canSleepForTick.getAsBoolean()); i++) {
+ QueuedUnload unload = iterator.next();
+ if (unload.unloadTick > currentTick) {
+ break;
+ }
+
+ long coordinate = unload.coordinate;
+
+ iterator.remove();
+ this.queuedUnloadsByCoordinate.remove(coordinate);
+
+ if (playerChunkMap.getUnloadingChunkHolder(net.minecraft.server.MCUtil.getCoordinateX(coordinate), net.minecraft.server.MCUtil.getCoordinateZ(coordinate)) != null
+ || playerChunkMap.getUpdatingChunkIfPresent(coordinate) != null) {
+ continue;
+ }
+
+ this.unloadData(coordinate);
+ }
+ }
+
+ @Override
+ public void unloadData(long coordinate) {
+ io.papermc.paper.util.TickThread.softEnsureTickThread("async unloading poi data");
+ super.unloadData(coordinate);
+ }
+
+ @Override
+ protected void onUnload(long coordinate) {
+ io.papermc.paper.util.TickThread.softEnsureTickThread("async poi unload callback");
+ this.loadedChunks.remove(coordinate);
+ int chunkX = net.minecraft.server.MCUtil.getCoordinateX(coordinate);
+ int chunkZ = net.minecraft.server.MCUtil.getCoordinateZ(coordinate);
+ for (int section = this.levelHeightAccessor.getMinSection(); section < this.levelHeightAccessor.getMaxSection(); ++section) {
+ long sectionPos = SectionPos.asLong(chunkX, section, chunkZ);
+ this.updateDistanceTracking(sectionPos);
+ }
+ }
+ // Paper end - actually unload POI data
+
public void add(BlockPos pos, Holder<PoiType> type) {
this.getOrCreate(SectionPos.asLong(pos)).add(pos, type);
}
@@ -201,8 +331,8 @@ public class PoiManager extends SectionStorage<PoiSection> {
}
public int sectionsToVillage(SectionPos pos) {
- this.distanceTracker.runAllUpdates();
- return this.distanceTracker.getLevel(pos.asLong());
+ this.villageDistanceTracker.propagateUpdates(); // Paper - replace distance tracking util
+ return convertBetweenLevels(this.villageDistanceTracker.getLevel(io.papermc.paper.util.CoordinateUtils.getChunkSectionKey(pos))); // Paper - replace distance tracking util
}
boolean isVillageCenter(long pos) {
@@ -217,7 +347,7 @@ public class PoiManager extends SectionStorage<PoiSection> {
@Override
public void tick(BooleanSupplier shouldKeepTicking) {
// Paper start - async chunk io
- while (!this.dirty.isEmpty() && shouldKeepTicking.getAsBoolean()) {
+ while (!this.dirty.isEmpty() && shouldKeepTicking.getAsBoolean() && !this.world.noSave()) { // Paper - unload POI data - don't write to disk if saving is disabled
ChunkPos chunkcoordintpair = SectionPos.of(this.dirty.firstLong()).chunk();
net.minecraft.nbt.CompoundTag data;
@@ -227,19 +357,24 @@ public class PoiManager extends SectionStorage<PoiSection> {
com.destroystokyo.paper.io.PaperFileIOThread.Holder.INSTANCE.scheduleSave(this.world,
chunkcoordintpair.x, chunkcoordintpair.z, data, null, com.destroystokyo.paper.io.PrioritizedTaskQueue.NORMAL_PRIORITY);
}
+ // Paper start - unload POI data
+ if (!this.world.noSave()) { // don't write to disk if saving is disabled
+ this.pollUnloads(shouldKeepTicking);
+ }
+ // Paper end - unload POI data
// Paper end
- this.distanceTracker.runAllUpdates();
+ this.villageDistanceTracker.propagateUpdates(); // Paper - replace distance tracking until
}
@Override
protected void setDirty(long pos) {
super.setDirty(pos);
- this.distanceTracker.update(pos, this.distanceTracker.getLevelFromSource(pos), false);
+ this.updateDistanceTracking(pos); // Paper - move to new distance tracking util
}
@Override
protected void onSectionLoad(long pos) {
- this.distanceTracker.update(pos, this.distanceTracker.getLevelFromSource(pos), false);
+ this.updateDistanceTracking(pos); // Paper - move to new distance tracking util
}
public void checkConsistencyWithBlocks(ChunkPos chunkPos, LevelChunkSection chunkSection) {
@@ -297,7 +432,7 @@ public class PoiManager extends SectionStorage<PoiSection> {
@Override
protected int getLevelFromSource(long id) {
- return PoiManager.this.isVillageCenter(id) ? 0 : 7;
+ return PoiManager.this.isVillageCenter(id) ? 0 : 7; // Paper - unload poi data - diff on change, this specifies the source level to use for distance tracking
}
@Override
diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/SectionStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/SectionStorage.java
index 10e8d1e36639cca21aa451e81cdab90ba9e9a496..954819db8ada38ef2c832151be8a96492e76390a 100644
--- a/src/main/java/net/minecraft/world/level/chunk/storage/SectionStorage.java
+++ b/src/main/java/net/minecraft/world/level/chunk/storage/SectionStorage.java
@@ -58,6 +58,40 @@ public class SectionStorage<R> extends RegionFileStorage implements AutoCloseabl
// Paper - remove mojang I/O thread
}
+ // Paper start - actually unload POI data
+ public void unloadData(long coordinate) {
+ ChunkPos chunkPos = new ChunkPos(coordinate);
+ this.flush(chunkPos);
+
+ Long2ObjectMap<Optional<R>> data = this.storage;
+ int before = data.size();
+
+ for (int section = this.levelHeightAccessor.getMinSection(); section < this.levelHeightAccessor.getMaxSection(); ++section) {
+ data.remove(SectionPos.asLong(chunkPos.x, section, chunkPos.z));
+ }
+
+ if (before != data.size()) {
+ this.onUnload(coordinate);
+ }
+ }
+
+ protected void onUnload(long coordinate) {}
+
+ public boolean isEmpty(long coordinate) {
+ Long2ObjectMap<Optional<R>> data = this.storage;
+ int x = net.minecraft.server.MCUtil.getCoordinateX(coordinate);
+ int z = net.minecraft.server.MCUtil.getCoordinateZ(coordinate);
+ for (int section = this.levelHeightAccessor.getMinSection(); section < this.levelHeightAccessor.getMaxSection(); ++section) {
+ Optional<R> optional = data.get(SectionPos.asLong(x, section, z));
+ if (optional != null && optional.orElse(null) != null) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+ // Paper end - actually unload POI data
+
protected void tick(BooleanSupplier shouldKeepTicking) {
while(this.hasWork() && shouldKeepTicking.getAsBoolean()) {
ChunkPos chunkPos = SectionPos.of(this.dirty.firstLong()).chunk();
@@ -175,6 +209,7 @@ public class SectionStorage<R> extends RegionFileStorage implements AutoCloseabl
});
}
}
+ if (this instanceof net.minecraft.world.entity.ai.village.poi.PoiManager) { ((net.minecraft.world.entity.ai.village.poi.PoiManager)this).queueUnload(pos.longKey, net.minecraft.server.MinecraftServer.currentTickLong + 1); } // Paper - unload POI data
}
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