99 lines
4.8 KiB
Diff
99 lines
4.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sat, 23 May 2020 01:31:06 -0400
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Subject: [PATCH] Fix Non Full Status Chunk NBT Memory Leak
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Any full status chunk that was requested for any status less than full
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would hold onto their entire nbt tree and every variable in that function.
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This was due to use of a lambda that persists on the Chunk object
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until that chunk reaches FULL status.
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With introduction of no tick, we greatly increased the number of non
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full chunks so this was really starting to hurt.
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We further improve it by making a copy of the nbt tag with only the memory
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it needs, so that we dont have to hold a copy to the entire compound.
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diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
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index 1e58958c3d7b10da5a5f22fc9591d9183e53e3cc..0adf14af9841cd3a20a8b2c0c320eb06794ef261 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
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@@ -26,6 +26,7 @@ import net.minecraft.nbt.CompoundTag;
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import net.minecraft.nbt.ListTag;
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import net.minecraft.nbt.LongArrayTag;
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import net.minecraft.nbt.ShortTag;
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+import net.minecraft.nbt.Tag;
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import net.minecraft.server.level.ServerChunkCache;
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import net.minecraft.server.level.ServerLevel;
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import net.minecraft.server.level.ServerPlayer;
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@@ -199,15 +200,9 @@ public class ChunkSerializer {
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object2 = protochunkticklist1;
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}
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- object = new LevelChunk(worldserver.getLevel(), chunkcoordintpair, biomestorage, chunkconverter, (TickList) object1, (TickList) object2, j, achunksection, (chunk) -> {
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- postLoadChunk(nbttagcompound1, chunk);
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- // CraftBukkit start - load chunk persistent data from nbt
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- net.minecraft.nbt.Tag persistentBase = nbttagcompound1.get("ChunkBukkitValues");
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- if (persistentBase instanceof CompoundTag) {
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- chunk.persistentDataContainer.putAll((CompoundTag) persistentBase);
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- }
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- // CraftBukkit end
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- });
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+ object = new LevelChunk(worldserver.getLevel(), chunkcoordintpair, biomestorage, chunkconverter, (TickList) object1, (TickList) object2, j, achunksection, // Paper start - fix massive nbt memory leak due to lambda. move lambda into a container method to not leak scope. Only clone needed NBT keys.
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+ createLoadEntitiesConsumer(new SafeNBTCopy(nbttagcompound1, "TileEntities", "Entities", "ChunkBukkitValues")) // Paper - move CB Chunk PDC into here
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+ );// Paper end
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} else {
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ProtoChunk protochunk = new ProtoChunk(chunkcoordintpair, chunkconverter, achunksection, protochunkticklist, protochunkticklist1, worldserver); // Paper - Anti-Xray - Add parameter
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@@ -313,6 +308,50 @@ public class ChunkSerializer {
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return new InProgressChunkHolder(protochunk1, tasksToExecuteOnMain); // Paper - Async chunk loading
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}
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}
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+ // Paper start
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+
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+ /**
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+ * This wrapper will error out if any key is accessed that wasn't copied so we can catch it easy on an update
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+ */
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+ private static class SafeNBTCopy extends CompoundTag {
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+ private final java.util.Set<String> keys = new java.util.HashSet<String>();
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+ public SafeNBTCopy(CompoundTag base, String... keys) {
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+ for (String key : keys) {
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+ this.keys.add(key);
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+ final Tag nbtBase = base.get(key);
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+ if (nbtBase != null) {
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+ this.put(key, nbtBase);
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+ }
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+ }
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+ }
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+
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+ @Override
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+ public boolean contains(String key) {
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+ if (super.contains(key)) {
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+ return true;
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+ } else if (keys.contains(key)) {
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+ return false;
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+ }
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+ throw new IllegalStateException("Missing Key " + key + " in SafeNBTCopy");
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+ }
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+
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+ @Override
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+ public boolean contains(String key, int type) {
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+ return contains(key) && super.contains(key, type);
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+ }
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+ }
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+ private static java.util.function.Consumer<LevelChunk> createLoadEntitiesConsumer(CompoundTag nbt) {
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+ return (chunk) -> {
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+ postLoadChunk(nbt, chunk);
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+ // CraftBukkit start - load chunk persistent data from nbt
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+ Tag persistentBase = nbt.get("ChunkBukkitValues");
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+ if (persistentBase instanceof CompoundTag) {
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+ chunk.persistentDataContainer.putAll((CompoundTag) persistentBase);
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+ }
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+ // CraftBukkit end
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+ };
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+ }
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+ // Paper end
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// Paper start - async chunk save for unload
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public static final class AsyncSaveData {
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