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Fix performance regression in loadChunk(x, z, false) (#2211)

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Resolve a regression where calling loadChunk(x, z, false) would
potentially double-load chunk data
This commit is contained in:
Spottedleaf 2019-06-22 13:04:26 -07:00 committed by Zach
parent 31891d1916
commit 693102cce7
1 changed files with 44 additions and 13 deletions
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57
Spigot-Server-Patches/0403-Fix-World-isChunkGenerated-calls.patch
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@ -1,4 +1,4 @@
From 27e5668efea88ccb9b7f77a1d7222b6b9f2ac65a Mon Sep 17 00:00:00 2001
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
@ -232,10 +232,23 @@ index 2e14d84657..d610253b95 100644
}
diff --git a/src/main/java/net/minecraft/server/RegionFileCache.java b/src/main/java/net/minecraft/server/RegionFileCache.java
index 6f34d8aea0..d1323891fa 100644
index 6f34d8aea0..d2b3289450 100644
--- a/src/main/java/net/minecraft/server/RegionFileCache.java
+++ b/src/main/java/net/minecraft/server/RegionFileCache.java
@@ -110,6 +110,7 @@ public abstract class RegionFileCache implements AutoCloseable {
@@ -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();
@ -243,7 +256,7 @@ index 6f34d8aea0..d1323891fa 100644
regionfile.setOversized(chunkX, chunkZ, false);
} catch (RegionFile.ChunkTooLargeException ignored) {
printOversizedLog("ChunkTooLarge! Someone is trying to duplicate.", regionfile.file, chunkX, chunkZ);
@@ -127,6 +128,7 @@ public abstract class RegionFileCache implements AutoCloseable {
@@ -127,6 +134,7 @@ public abstract class RegionFileCache implements AutoCloseable {
if (SIZE_THRESHOLD == OVERZEALOUS_THRESHOLD) {
resetFilterThresholds();
}
@ -252,7 +265,7 @@ index 6f34d8aea0..d1323891fa 100644
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..53d4f46d45 100644
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 {
@ -277,7 +290,7 @@ index e0d89cc533..53d4f46d45 100644
} catch (IOException ex) {
throw new RuntimeException(ex);
}
@@ -500,20 +512,14 @@ public class CraftWorld implements World {
@@ -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
@ -288,13 +301,22 @@ index e0d89cc533..53d4f46d45 100644
- // 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;
+ // Paper - Optimize this method
+ if (!generate && !isChunkGenerated(x, z)) {
+ 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;
@ -305,7 +327,7 @@ index e0d89cc533..53d4f46d45 100644
}
@Override
@@ -2127,21 +2133,11 @@ public class CraftWorld implements World {
@@ -2127,21 +2143,20 @@ public class CraftWorld implements World {
// Paper start
private Chunk getChunkAtGen(int x, int z, boolean gen) {
@ -322,8 +344,17 @@ index e0d89cc533..53d4f46d45 100644
- if (chunk instanceof net.minecraft.server.Chunk) {
- return ((net.minecraft.server.Chunk)chunk).bukkitChunk;
+ // Note: Copied from loadChunk()
+ if (!gen && !isChunkGenerated(x, z)) {
+ return null;
+ 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;