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Paper/Spigot-Server-Patches/0403-Fix-World-isChunkGenerated-calls.patch
Spottedleaf 693102cce7 Fix performance regression in loadChunk(x, z, false) (#2211) 
Resolve a regression where calling loadChunk(x, z, false) would
potentially double-load chunk data
2019-06-22 15:04:26 -05:00

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From 23a4b689721fa3621f748f7f49390748eb82cf15 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 d83eec0d76..459bd619ee 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -29,7 +29,7 @@ public class ChunkProviderServer extends IChunkProvider {
private final WorldServer world;
private final Thread serverThread;
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;
@@ -119,6 +119,36 @@ public class ChunkProviderServer extends IChunkProvider {
return playerChunk.getFullChunk();
}
+
+ @Nullable
+ public IChunkAccess getChunkAtImmediately(int x, int z) {
+ if (Thread.currentThread() != this.serverThread) {
+ return CompletableFuture.supplyAsync(() -> {
+ return this.getChunkAtImmediately(x, z);
+ }, this.serverThreadQueue).join();
+ }
+
+ long k = ChunkCoordIntPair.pair(x, z);
+
+ IChunkAccess ichunkaccess;
+
+ for (int l = 0; l < 4; ++l) {
+ if (k == this.cachePos[l]) {
+ ichunkaccess = this.cacheChunk[l];
+ if (ichunkaccess != null) { // CraftBukkit - the chunk can become accessible in the meantime TODO for non-null chunks it might also make sense to check that the chunk's state hasn't changed in the meantime
+ return ichunkaccess;
+ }
+ }
+ }
+
+ 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 2f749fe26a..4906530d83 100644
--- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java
+++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
@@ -409,6 +409,17 @@ public class ChunkRegionLoader {
return nbttagcompound;
}
+ // 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 dd1822d6ff..e324989b46 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/PlayerChunk.java b/src/main/java/net/minecraft/server/PlayerChunk.java
index 806d225aaa..97040528a0 100644
--- a/src/main/java/net/minecraft/server/PlayerChunk.java
+++ b/src/main/java/net/minecraft/server/PlayerChunk.java
@@ -70,6 +70,19 @@ 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 b71f98b0c5..e89738a08d 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -811,10 +811,23 @@ 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.m, nbttagcompound, chunkcoordintpair, world); // CraftBukkit
+ // Paper start - Cache chunk status on disk
+ if (nbttagcompound == null) {
+ return null;
+ }
+
+ nbttagcompound = this.getChunkData(this.world.getWorldProvider().getDimensionManager(), this.m, nbttagcompound, chunkcoordintpair, world); // CraftBukkit
+ if (nbttagcompound == null) {
+ return null;
+ }
+
+ this.getRegionFile(chunkcoordintpair, false).setStatus(chunkcoordintpair.x, chunkcoordintpair.z, ChunkRegionLoader.getStatus(nbttagcompound));
+
+ return nbttagcompound;
+ // Paper end
}
// Spigot Start
diff --git a/src/main/java/net/minecraft/server/RegionFile.java b/src/main/java/net/minecraft/server/RegionFile.java
index 2e14d84657..d610253b95 100644
--- a/src/main/java/net/minecraft/server/RegionFile.java
+++ b/src/main/java/net/minecraft/server/RegionFile.java
@@ -31,6 +31,47 @@ public class RegionFile implements AutoCloseable {
private final int[] d = new int[1024];private int[] timestamps = d; // Paper - OBFHELPER
private final List<Boolean> e; private List<Boolean> getFreeSectors() { return this.e; } // Paper - OBFHELPER
+ // 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];
+ }
+
+ public ChunkStatus getStatus(int x, int z, PlayerChunkMap playerChunkMap) throws IOException {
+ if (this.closed) {
+ // We've used an invalid region file.
+ throw new java.io.EOFException("RegionFile is closed");
+ }
+ ChunkCoordIntPair chunkPos = new ChunkCoordIntPair(x, z);
+ int location = this.getChunkLocation(chunkPos);
+ ChunkStatus cached = this.statuses[location];
+ if (cached != null) {
+ return cached;
+ }
+
+ playerChunkMap.readChunkData(chunkPos); // This will set our status (yes it's disgusting)
+
+ return this.statuses[location];
+ }
+ // Paper end
+
public RegionFile(File file) throws IOException {
this.b = new RandomAccessFile(file, "rw");
this.file = file; // Spigot // Paper - We need this earlier
@@ -299,6 +340,7 @@ public class RegionFile implements AutoCloseable {
this.writeInt(i); // Paper - Avoid 3 io write calls
}
+ private final int getChunkLocation(ChunkCoordIntPair chunkcoordintpair) { return this.f(chunkcoordintpair); } // Paper - OBFHELPER
private int f(ChunkCoordIntPair chunkcoordintpair) {
return chunkcoordintpair.j() + chunkcoordintpair.k() * 32;
}
@@ -312,6 +354,7 @@ public class RegionFile implements AutoCloseable {
}
public void close() throws IOException {
+ this.closed = true; // Paper
this.b.close();
}
diff --git a/src/main/java/net/minecraft/server/RegionFileCache.java b/src/main/java/net/minecraft/server/RegionFileCache.java
index 6f34d8aea0..d2b3289450 100644
--- a/src/main/java/net/minecraft/server/RegionFileCache.java
+++ b/src/main/java/net/minecraft/server/RegionFileCache.java
@@ -47,6 +47,12 @@ public abstract class RegionFileCache implements AutoCloseable {
// Paper start
}
+ // Paper start
+ public RegionFile getRegionFileIfLoaded(ChunkCoordIntPair chunkcoordintpair) {
+ return this.cache.getAndMoveToFirst(ChunkCoordIntPair.pair(chunkcoordintpair.getRegionX(), chunkcoordintpair.getRegionZ()));
+ }
+ // Paper end
+
public RegionFile getRegionFile(ChunkCoordIntPair chunkcoordintpair, boolean existingOnly) throws IOException { return this.a(chunkcoordintpair, existingOnly); } // Paper - OBFHELPER
private RegionFile a(ChunkCoordIntPair chunkcoordintpair, boolean existingOnly) throws IOException { // CraftBukkit
long i = ChunkCoordIntPair.pair(chunkcoordintpair.getRegionX(), chunkcoordintpair.getRegionZ());
@@ -110,6 +116,7 @@ public abstract class RegionFileCache implements AutoCloseable {
try {
NBTCompressedStreamTools.writeNBT(nbttagcompound, out);
out.close();
+ regionfile.setStatus(chunk.x, chunk.z, ChunkRegionLoader.getStatus(nbttagcompound)); // Paper - cache status on disk
regionfile.setOversized(chunkX, chunkZ, false);
} catch (RegionFile.ChunkTooLargeException ignored) {
printOversizedLog("ChunkTooLarge! Someone is trying to duplicate.", regionfile.file, chunkX, chunkZ);
@@ -127,6 +134,7 @@ public abstract class RegionFileCache implements AutoCloseable {
if (SIZE_THRESHOLD == OVERZEALOUS_THRESHOLD) {
resetFilterThresholds();
}
+ regionfile.setStatus(chunk.x, chunk.z, ChunkRegionLoader.getStatus(nbttagcompound)); // Paper - cache status on disk
} catch (RegionFile.ChunkTooLargeException e) {
printOversizedLog("ChunkTooLarge even after reduction. Trying in overzealous mode.", regionfile.file, chunkX, chunkZ);
// Eek, major fail. We have retry logic, so reduce threshholds and fall back
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index e0d89cc533..9bb1ad077a 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -387,8 +387,20 @@ 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) {
+ return chunk instanceof ProtoChunkExtension || chunk instanceof net.minecraft.server.Chunk;
+ }
try {
- return world.getChunkProvider().getChunkAtIfCachedImmediately(x, z) != null || world.getChunkProvider().playerChunkMap.chunkExists(new ChunkCoordIntPair(x, z)); // Paper
+ return world.getChunkProvider().playerChunkMap.getRegionFile(new ChunkCoordIntPair(x, z), false)
+ .getStatus(x, z, world.getChunkProvider().playerChunkMap) == ChunkStatus.FULL;
+ // Paper end
} catch (IOException ex) {
throw new RuntimeException(ex);
}
@@ -500,20 +512,24 @@ 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);
-
- // 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);
- }
+ // Paper - Optimize this method
+ if (!generate) {
+ net.minecraft.server.RegionFile file = world.getChunkProvider().playerChunkMap.getRegionFileIfLoaded(new ChunkCoordIntPair(x, z));
+ if (file != null && file.getStatusIfCached(x, z) != ChunkStatus.FULL) {
+ return false;
+ }
- if (chunk instanceof net.minecraft.server.Chunk) {
- world.getChunkProvider().addTicket(TicketType.PLUGIN, new ChunkCoordIntPair(x, z), 1, Unit.INSTANCE);
- return true;
+ 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, new ChunkCoordIntPair(x, z), 1, Unit.INSTANCE);
+ world.getChunkProvider().getChunkAt(x, z, ChunkStatus.FULL, true);
+ return true;
+ // Paper end
}
@Override
@@ -2127,21 +2143,20 @@ public class CraftWorld implements World {
// Paper start
private Chunk getChunkAtGen(int x, int z, boolean gen) {
- // copied from loadChunk()
- // this function is identical except we do not add a plugin ticket
- IChunkAccess chunk = world.getChunkProvider().getChunkAt(x, z, gen || isChunkGenerated(x, z) ? ChunkStatus.FULL : ChunkStatus.EMPTY, true);
-
- // 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 (chunk instanceof net.minecraft.server.Chunk) {
- return ((net.minecraft.server.Chunk)chunk).bukkitChunk;
+ // Note: Copied from loadChunk()
+ if (!gen) {
+ net.minecraft.server.RegionFile file = world.getChunkProvider().playerChunkMap.getRegionFileIfLoaded(new ChunkCoordIntPair(x, z));
+ if (file != null && file.getStatusIfCached(x, z) != ChunkStatus.FULL) {
+ return null;
+ }
+ IChunkAccess chunk = world.getChunkProvider().getChunkAt(x, z, ChunkStatus.EMPTY, true);
+ if (!(chunk instanceof ProtoChunkExtension) && !(chunk instanceof net.minecraft.server.Chunk)) {
+ return null;
+ }
+ // fall through to load
+ // we do this so we do not re-read the chunk data on disk
}
-
- return null;
+ return ((net.minecraft.server.Chunk)world.getChunkProvider().getChunkAt(x, z, ChunkStatus.FULL, true)).bukkitChunk;
}
@Override
--
2.21.0
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