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Paper/Spigot-Server-Patches/0380-Fix-World-isChunkGenerated-calls.patch
Aikar 7e1525ea2d
Many improvements to chunk prioritization and bug fixes 
Fixed a few bugs, and made numerous improvements.
Fixed issue where a sync chunk load could have its ticket removed and the
priority ticket could expire...
Still not perfect there but better than before.

Also fixed few other misc issues such as watchdog cpu usage, chunk queue update
had risk of double enqueue due to it no longer being a set.

Added much more information about chunk state to watchdog prints.

I see some more room for improvement even, but this is much better than before.

Fixes #3407
Fixes #3411
Fixes #3395
Fixes #3389
2020-05-20 05:13:01 -04:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sat, 15 Jun 2019 08:54:33 -0700
Subject: [PATCH] Fix World#isChunkGenerated calls
Optimize World#loadChunk() too
This patch also adds a chunk status cache on region files (note that
its only purpose is to cache the status on DISK)
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 6713b7667ae4fe3f1f555a71321832b4a9492162..4c9c8e483974f8869d6711626620cfd7d814d956 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -28,7 +28,7 @@ public class ChunkProviderServer extends IChunkProvider {
private final WorldServer world;
public final Thread serverThread; // Paper - private -> public
private final LightEngineThreaded lightEngine;
- private final ChunkProviderServer.a serverThreadQueue;
+ public final ChunkProviderServer.a serverThreadQueue; // Paper private -> public
public final PlayerChunkMap playerChunkMap;
private final WorldPersistentData worldPersistentData;
private long lastTickTime;
@@ -284,6 +284,21 @@ public class ChunkProviderServer extends IChunkProvider {
return ret;
}
+
+ @Nullable
+ public IChunkAccess getChunkAtImmediately(int x, int z) {
+ long k = ChunkCoordIntPair.pair(x, z);
+
+ // Note: Bypass cache to make this MT-Safe
+
+ PlayerChunk playerChunk = this.getChunk(k);
+ if (playerChunk == null) {
+ return null;
+ }
+
+ return playerChunk.getAvailableChunkNow();
+
+ }
// Paper end
@Nullable
diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
index f54572773c25b6716a68166efa8d3fc8b22b6258..8e4b3e52cbc95e24b1d72aed9ec8c32b94a91561 100644
--- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java
+++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
@@ -403,6 +403,17 @@ public class ChunkRegionLoader {
}
// Paper end
+ // Paper start
+ public static ChunkStatus getStatus(NBTTagCompound compound) {
+ if (compound == null) {
+ return null;
+ }
+
+ // Note: Copied from below
+ return ChunkStatus.getStatus(compound.getCompound("Level").getString("Status"));
+ }
+ // Paper end
+
public static ChunkStatus.Type a(@Nullable NBTTagCompound nbttagcompound) {
if (nbttagcompound != null) {
ChunkStatus chunkstatus = ChunkStatus.a(nbttagcompound.getCompound("Level").getString("Status"));
diff --git a/src/main/java/net/minecraft/server/ChunkStatus.java b/src/main/java/net/minecraft/server/ChunkStatus.java
index efdf611e66ffd782291de749d8a48f3bf08f2129..134a4f0b7d254b5dd8ca26a9c5874532826978c4 100644
--- a/src/main/java/net/minecraft/server/ChunkStatus.java
+++ b/src/main/java/net/minecraft/server/ChunkStatus.java
@@ -176,6 +176,7 @@ public class ChunkStatus {
return this.s;
}
+ public ChunkStatus getPreviousStatus() { return this.e(); } // Paper - OBFHELPER
public ChunkStatus e() {
return this.u;
}
@@ -196,6 +197,17 @@ public class ChunkStatus {
return this.y;
}
+ // Paper start
+ public static ChunkStatus getStatus(String name) {
+ try {
+ // We need this otherwise we return EMPTY for invalid names
+ MinecraftKey key = new MinecraftKey(name);
+ return IRegistry.CHUNK_STATUS.getOptional(key).orElse(null);
+ } catch (Exception ex) {
+ return null; // invalid name
+ }
+ }
+ // Paper end
public static ChunkStatus a(String s) {
return (ChunkStatus) IRegistry.CHUNK_STATUS.get(MinecraftKey.a(s));
}
diff --git a/src/main/java/net/minecraft/server/IChunkLoader.java b/src/main/java/net/minecraft/server/IChunkLoader.java
index f0a052eec2fb72b11dc70bf62a5e57f599bbc190..2f95174fcc467908808ed3f2dc956bdcafdc3558 100644
--- a/src/main/java/net/minecraft/server/IChunkLoader.java
+++ b/src/main/java/net/minecraft/server/IChunkLoader.java
@@ -8,7 +8,7 @@ import javax.annotation.Nullable;
public class IChunkLoader implements AutoCloseable {
- private final IOWorker a;
+ private final IOWorker a; public IOWorker getIOWorker() { return a; } // Paper - OBFHELPER
protected final DataFixer b;
@Nullable
private PersistentStructureLegacy c;
diff --git a/src/main/java/net/minecraft/server/PlayerChunk.java b/src/main/java/net/minecraft/server/PlayerChunk.java
index ed9ada49c7cc1131691bd6e005b2380274ef23e3..52ea4f05a0c7f29f62f31bb032a5ceb905107e60 100644
--- a/src/main/java/net/minecraft/server/PlayerChunk.java
+++ b/src/main/java/net/minecraft/server/PlayerChunk.java
@@ -115,6 +115,19 @@ public class PlayerChunk {
Either<IChunkAccess, PlayerChunk.Failure> either = (Either<IChunkAccess, PlayerChunk.Failure>) statusFuture.getNow(null);
return either == null ? null : (Chunk) either.left().orElse(null);
}
+
+ public IChunkAccess getAvailableChunkNow() {
+ // TODO can we just getStatusFuture(EMPTY)?
+ for (ChunkStatus curr = ChunkStatus.FULL, next = curr.getPreviousStatus(); curr != next; curr = next, next = next.getPreviousStatus()) {
+ CompletableFuture<Either<IChunkAccess, PlayerChunk.Failure>> future = this.getStatusFutureUnchecked(curr);
+ Either<IChunkAccess, PlayerChunk.Failure> either = future.getNow(null);
+ if (either == null || !either.left().isPresent()) {
+ continue;
+ }
+ return either.left().get();
+ }
+ return null;
+ }
// Paper end
public CompletableFuture<Either<IChunkAccess, PlayerChunk.Failure>> getStatusFutureUnchecked(ChunkStatus chunkstatus) {
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index 4f5b516144829a7ae11f21a56789ac7a1f256250..1d517fd1aea90edf470388fd857a41f2be149327 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -969,12 +969,62 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
}
@Nullable
- private NBTTagCompound readChunkData(ChunkCoordIntPair chunkcoordintpair) throws IOException {
+ public NBTTagCompound readChunkData(ChunkCoordIntPair chunkcoordintpair) throws IOException { // Paper - private -> public
NBTTagCompound nbttagcompound = this.read(chunkcoordintpair);
- return nbttagcompound == null ? null : this.getChunkData(this.world.getWorldProvider().getDimensionManager(), this.l, nbttagcompound, chunkcoordintpair, world); // CraftBukkit
+ // Paper start - Cache chunk status on disk
+ if (nbttagcompound == null) {
+ return null;
+ }
+
+ nbttagcompound = this.getChunkData(this.world.getWorldProvider().getDimensionManager(), this.l, nbttagcompound, chunkcoordintpair, world); // CraftBukkit
+ if (nbttagcompound == null) {
+ return null;
+ }
+
+ this.updateChunkStatusOnDisk(chunkcoordintpair, nbttagcompound);
+
+ return nbttagcompound;
+ // Paper end
+ }
+
+ // Paper start - chunk status cache "api"
+ public ChunkStatus getChunkStatusOnDiskIfCached(ChunkCoordIntPair chunkPos) {
+ RegionFile regionFile = this.getIOWorker().getRegionFileCache().getRegionFileIfLoaded(chunkPos);
+
+ return regionFile == null ? null : regionFile.getStatusIfCached(chunkPos.x, chunkPos.z);
}
+ public ChunkStatus getChunkStatusOnDisk(ChunkCoordIntPair chunkPos) throws IOException {
+ RegionFile regionFile = this.getIOWorker().getRegionFileCache().getFile(chunkPos, false);
+
+ if (!regionFile.chunkExists(chunkPos)) {
+ return null;
+ }
+
+ ChunkStatus status = regionFile.getStatusIfCached(chunkPos.x, chunkPos.z);
+
+ if (status != null) {
+ return status;
+ }
+
+ this.readChunkData(chunkPos);
+
+ return regionFile.getStatusIfCached(chunkPos.x, chunkPos.z);
+ }
+
+ public void updateChunkStatusOnDisk(ChunkCoordIntPair chunkPos, @Nullable NBTTagCompound compound) throws IOException {
+ RegionFile regionFile = this.getIOWorker().getRegionFileCache().getFile(chunkPos, false);
+
+ regionFile.setStatus(chunkPos.x, chunkPos.z, ChunkRegionLoader.getStatus(compound));
+ }
+
+ public IChunkAccess getUnloadingChunk(int chunkX, int chunkZ) {
+ PlayerChunk chunkHolder = this.pendingUnload.get(ChunkCoordIntPair.pair(chunkX, chunkZ));
+ return chunkHolder == null ? null : chunkHolder.getAvailableChunkNow();
+ }
+ // Paper end
+
boolean isOutsideOfRange(ChunkCoordIntPair chunkcoordintpair) {
// Spigot start
return isOutsideOfRange(chunkcoordintpair, false);
diff --git a/src/main/java/net/minecraft/server/RegionFile.java b/src/main/java/net/minecraft/server/RegionFile.java
index 6b543f89d4e32fb79bfe9aa7b815e4117dbea602..d37abf2cf304f81405e570588c8accbc44a629f4 100644
--- a/src/main/java/net/minecraft/server/RegionFile.java
+++ b/src/main/java/net/minecraft/server/RegionFile.java
@@ -36,6 +36,30 @@ public class RegionFile implements AutoCloseable {
private final RegionFileBitSet freeSectors;
public final File file;
+ // Paper start - Cache chunk status
+ private final ChunkStatus[] statuses = new ChunkStatus[32 * 32];
+
+ private boolean closed;
+
+ // invoked on write/read
+ public void setStatus(int x, int z, ChunkStatus status) {
+ if (this.closed) {
+ // We've used an invalid region file.
+ throw new IllegalStateException("RegionFile is closed");
+ }
+ this.statuses[this.getChunkLocation(new ChunkCoordIntPair(x, z))] = status;
+ }
+
+ public ChunkStatus getStatusIfCached(int x, int z) {
+ if (this.closed) {
+ // We've used an invalid region file.
+ throw new IllegalStateException("RegionFile is closed");
+ }
+ final int location = this.getChunkLocation(new ChunkCoordIntPair(x, z));
+ return this.statuses[location];
+ }
+ // Paper end
+
public RegionFile(File file, File file1) throws IOException {
this(file.toPath(), file1.toPath(), RegionFileCompression.b);
}
@@ -350,11 +374,13 @@ public class RegionFile implements AutoCloseable {
return this.getOffset(chunkcoordintpair) != 0;
}
+ private final int getChunkLocation(ChunkCoordIntPair chunkcoordintpair) { return this.g(chunkcoordintpair); } // Paper - OBFHELPER
private static int g(ChunkCoordIntPair chunkcoordintpair) {
return chunkcoordintpair.j() + chunkcoordintpair.k() * 32;
}
public void close() throws IOException {
+ this.closed = true; // Paper
try {
this.c();
} finally {
diff --git a/src/main/java/net/minecraft/server/RegionFileCache.java b/src/main/java/net/minecraft/server/RegionFileCache.java
index 942b7d323936a872d83c536c1901b4b436aa7e7c..2f8af42e2aadeb1b11db94fdb54ec0ba9e30f095 100644
--- a/src/main/java/net/minecraft/server/RegionFileCache.java
+++ b/src/main/java/net/minecraft/server/RegionFileCache.java
@@ -18,7 +18,14 @@ public final class RegionFileCache implements AutoCloseable {
this.b = file;
}
- private RegionFile getFile(ChunkCoordIntPair chunkcoordintpair, boolean existingOnly) throws IOException { // CraftBukkit
+
+ // Paper start
+ public RegionFile getRegionFileIfLoaded(ChunkCoordIntPair chunkcoordintpair) {
+ return this.cache.getAndMoveToFirst(ChunkCoordIntPair.pair(chunkcoordintpair.getRegionX(), chunkcoordintpair.getRegionZ()));
+ }
+
+ // Paper end
+ public RegionFile getFile(ChunkCoordIntPair chunkcoordintpair, boolean existingOnly) throws IOException { // CraftBukkit // Paper - private > public
long i = ChunkCoordIntPair.pair(chunkcoordintpair.getRegionX(), chunkcoordintpair.getRegionZ());
RegionFile regionfile = (RegionFile) this.cache.getAndMoveToFirst(i);
@@ -165,7 +172,8 @@ public final class RegionFileCache implements AutoCloseable {
try {
NBTCompressedStreamTools.a(nbttagcompound, (DataOutput) dataoutputstream);
- regionfile.setOversized(chunkcoordintpair.x, chunkcoordintpair.z, false); // We don't do this anymore
+ regionfile.setStatus(chunkcoordintpair.x, chunkcoordintpair.z, ChunkRegionLoader.getStatus(nbttagcompound)); // Paper - cache status on disk
+ regionfile.setOversized(chunkcoordintpair.x, chunkcoordintpair.z, false);
} catch (Throwable throwable1) {
throwable = throwable1;
throw throwable1;
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 8f8c18c5a4f483acee0d61a8007577ac8193bef9..50467656df0b54c2dcba8696b5677a2fc975b178 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -19,6 +19,7 @@ import java.util.Objects;
import java.util.Random;
import java.util.Set;
import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import net.minecraft.server.ArraySetSorted;
@@ -410,8 +411,22 @@ public class CraftWorld implements World {
@Override
public boolean isChunkGenerated(int x, int z) {
+ // Paper start - Fix this method
+ if (!Bukkit.isPrimaryThread()) {
+ return CompletableFuture.supplyAsync(() -> {
+ return CraftWorld.this.isChunkGenerated(x, z);
+ }, world.getChunkProvider().serverThreadQueue).join();
+ }
+ IChunkAccess chunk = world.getChunkProvider().getChunkAtImmediately(x, z);
+ if (chunk == null) {
+ chunk = world.getChunkProvider().playerChunkMap.getUnloadingChunk(x, z);
+ }
+ if (chunk != null) {
+ return chunk instanceof ProtoChunkExtension || chunk instanceof net.minecraft.server.Chunk;
+ }
try {
- return world.getChunkProvider().getChunkAtIfCachedImmediately(x, z) != null || world.getChunkProvider().playerChunkMap.read(new ChunkCoordIntPair(x, z)) != null; // Paper (TODO check if the first part can be removed)
+ return world.getChunkProvider().playerChunkMap.getChunkStatusOnDisk(new ChunkCoordIntPair(x, z)) == ChunkStatus.FULL;
+ // Paper end
} catch (IOException ex) {
throw new RuntimeException(ex);
}
@@ -523,20 +538,49 @@ public class CraftWorld implements World {
@Override
public boolean loadChunk(int x, int z, boolean generate) {
org.spigotmc.AsyncCatcher.catchOp("chunk load"); // Spigot
- IChunkAccess chunk = world.getChunkProvider().getChunkAt(x, z, generate || isChunkGenerated(x, z) ? ChunkStatus.FULL : ChunkStatus.EMPTY, true); // Paper
+ // Paper start - Optimize this method
+ ChunkCoordIntPair chunkPos = new ChunkCoordIntPair(x, z);
- // If generate = false, but the chunk already exists, we will get this back.
- if (chunk instanceof ProtoChunkExtension) {
- // We then cycle through again to get the full chunk immediately, rather than after the ticket addition
- chunk = world.getChunkProvider().getChunkAt(x, z, ChunkStatus.FULL, true);
- }
+ if (!generate) {
- if (chunk instanceof net.minecraft.server.Chunk) {
- world.getChunkProvider().addTicket(TicketType.PLUGIN, new ChunkCoordIntPair(x, z), 1, Unit.INSTANCE);
- return true;
+ IChunkAccess immediate = world.getChunkProvider().getChunkAtImmediately(x, z);
+ if (immediate == null) {
+ immediate = world.getChunkProvider().playerChunkMap.getUnloadingChunk(x, z);
+ }
+ if (immediate != null) {
+ if (!(immediate instanceof ProtoChunkExtension) && !(immediate instanceof net.minecraft.server.Chunk)) {
+ return false; // not full status
+ }
+ world.getChunkProvider().addTicket(TicketType.PLUGIN, chunkPos, 1, Unit.INSTANCE);
+ world.getChunkAt(x, z); // make sure we're at ticket level 32 or lower
+ return true;
+ }
+
+ net.minecraft.server.RegionFile file;
+ try {
+ file = world.getChunkProvider().playerChunkMap.getIOWorker().getRegionFileCache().getFile(chunkPos, false);
+ } catch (IOException ex) {
+ throw new RuntimeException(ex);
+ }
+
+ ChunkStatus status = file.getStatusIfCached(x, z);
+ if (!file.chunkExists(chunkPos) || (status != null && status != ChunkStatus.FULL)) {
+ return false;
+ }
+
+ IChunkAccess chunk = world.getChunkProvider().getChunkAt(x, z, ChunkStatus.EMPTY, true);
+ if (!(chunk instanceof ProtoChunkExtension) && !(chunk instanceof net.minecraft.server.Chunk)) {
+ return false;
+ }
+
+ // fall through to load
+ // we do this so we do not re-read the chunk data on disk
}
- return false;
+ world.getChunkProvider().addTicket(TicketType.PLUGIN, chunkPos, 1, Unit.INSTANCE);
+ world.getChunkProvider().getChunkAt(x, z, ChunkStatus.FULL, true);
+ return true;
+ // Paper end
}
@Override
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