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papermc/Spigot-Server-Patches/0532-Unload-leaked-Cached-Chunks.patch
Aikar ff4ca31f0d
Fix premature unloading of neighbor chunks for world gen 
We must check the level tracker as ticket levels add "virtual"
tickets to neighbors.

Also added neighbor tracking during generation to be extra safe.

Fixes #3465
Fixes #3451
Fixes #3459
2020-05-28 22:59:40 -04:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 25 May 2020 11:02:42 -0400
Subject: [PATCH] Unload leaked Cached Chunks
Due to some complexity in mojangs complicated chain of juggling
whether or not a chunk should be unloaded when the last ticket is
removed, many chunks are remaining around in the cache.
These chunks are never being targetted for unload because they are
vastly out of view distance range and have no reason to be looked at.
This is a huge issue for performance because we have to iterate these
chunks EVERY TICK... This is what's been leading to high SELF time in
Ticking Chunks timings/profiler results.
We will now detect these chunks in that iteration, and automatically
add it to the unload queue when the chunk is found without any tickets.
diff --git a/src/main/java/net/minecraft/server/ChunkMapDistance.java b/src/main/java/net/minecraft/server/ChunkMapDistance.java
index 9805361e2d49fa1cfecf0c5811187fc503d0ad8e..91b9946f987a397960a08c7a606fcf4e2607e0ae 100644
--- a/src/main/java/net/minecraft/server/ChunkMapDistance.java
+++ b/src/main/java/net/minecraft/server/ChunkMapDistance.java
@@ -33,7 +33,7 @@ public abstract class ChunkMapDistance {
public final Long2ObjectOpenHashMap<ArraySetSorted<Ticket<?>>> tickets = new Long2ObjectOpenHashMap();
private final ChunkMapDistance.a e = new ChunkMapDistance.a();
public static final int MOB_SPAWN_RANGE = 8; //private final ChunkMapDistance.b f = new ChunkMapDistance.b(8); // Paper - no longer used
- private final ChunkMapDistance.c g = new ChunkMapDistance.c(33);
+ private final ChunkMapDistance.c g = new ChunkMapDistance.c(33); public final ChunkMapDistance.c getLevelTracker() { return g; } // Paper
// Paper start use a queue, but still keep unique requirement
public final java.util.Queue<PlayerChunk> pendingChunkUpdates = new java.util.ArrayDeque<PlayerChunk>() {
@Override
@@ -471,6 +471,12 @@ public abstract class ChunkMapDistance {
this.e = i;
}
+ // Paper start - check diff below
+ public boolean isChunkLoaded(long i) {
+ return this.c(this.c(i));
+ }
+ // Paper end
+
private void a(long i, int j, boolean flag, boolean flag1) {
if (flag != flag1) {
Ticket<?> ticket = new Ticket<>(TicketType.PLAYER, 33, new ChunkCoordIntPair(i)); // Paper - no-tick view distance
@@ -478,7 +484,7 @@ public abstract class ChunkMapDistance {
if (flag1) {
ChunkMapDistance.this.j.a(ChunkTaskQueueSorter.a(() -> { // CraftBukkit - decompile error
ChunkMapDistance.this.m.execute(() -> {
- if (this.c(this.c(i))) {
+ if (this.c(this.c(i))) { // Paper - diff above isChunkLoaded
ChunkMapDistance.this.addTicket(i, ticket);
ChunkMapDistance.this.l.add(i);
} else {
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 54e89c9cc6c47ff2c4f4dd5d4c22a391f8a3d6e0..32b6d28cd28d60937eca14187287645ea2797da7 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -560,6 +560,7 @@ public class ChunkProviderServer extends IChunkProvider {
}
}
// Paper start
+ if (playerchunk != null) playerchunk.lastActivity = world.getTime(); // Paper
CompletableFuture<Either<IChunkAccess, PlayerChunk.Failure>> future = this.a(playerchunk, l) ? PlayerChunk.UNLOADED_CHUNK_ACCESS_FUTURE : playerchunk.a(chunkstatus, this.playerChunkMap);
if (isUrgent) {
future.thenAccept(either -> this.chunkMapDistance.clearUrgent(chunkcoordintpair));
@@ -812,6 +813,7 @@ public class ChunkProviderServer extends IChunkProvider {
this.world.timings.countNaturalMobs.stopTiming(); // Paper - timings
this.world.getMethodProfiler().exit();
// Paper - replaced by above
+ final long time = world.getTime(); // Paper
final int[] chunksTicked = {0}; this.playerChunkMap.forEachVisibleChunk((playerchunk) -> { // Paper - safe iterator incase chunk loads, also no wrapping
Optional<Chunk> optional = ((Either) playerchunk.b().getNow(PlayerChunk.UNLOADED_CHUNK)).left();
@@ -897,7 +899,7 @@ public class ChunkProviderServer extends IChunkProvider {
this.world.timings.chunkTicks.stopTiming(); // Spigot // Paper
if (chunksTicked[0]++ % 10 == 0) this.world.getMinecraftServer().midTickLoadChunks(); // Paper
}
- }
+ } else { checkInactiveChunk(playerchunk, time); } // Paper - check inaccessible chunks
});
this.world.getMethodProfiler().enter("customSpawners");
if (flag1) {
@@ -913,6 +915,40 @@ public class ChunkProviderServer extends IChunkProvider {
this.playerChunkMap.g();
}
+ // Paper start - remove inaccessible chunks leaked
+ private void checkInactiveChunk(PlayerChunk playerchunk, long time) {
+ int ticketLevel = playerchunk.getTicketLevel();
+ if (ticketLevel > 33 && ticketLevel == playerchunk.oldTicketLevel &&
+ (playerchunk.lastActivity == 0 || time - playerchunk.lastActivity > 20*5) &&
+ playerchunk.location.pair() % 20 == 0 && playerChunkMap.unloadQueue.size() < 100
+ ) {
+ ChunkStatus chunkHolderStatus = playerchunk.getChunkHolderStatus();
+ ChunkStatus desiredStatus = PlayerChunk.getChunkStatus(ticketLevel);
+ if (chunkHolderStatus != null && !chunkHolderStatus.isAtLeastStatus(desiredStatus)) {
+ return;
+ }
+ if (playerchunk.lastActivity == 0) {
+ playerchunk.lastActivity = time;
+ return;
+ }
+ playerchunk.lastActivity = time;
+ Chunk chunk = playerchunk.getChunk();
+ if ((chunk != null && chunk.isAnyNeighborsLoaded()) || !playerchunk.neighborPriorities.isEmpty() || !playerchunk.dependendedOnBy.isEmpty()) {
+ return;
+ }
+ long key = playerchunk.location.pair();
+ if (playerChunkMap.playerViewDistanceNoTickMap.getObjectsInRange(key) != null) {
+ return;
+ }
+ PlayerChunkMap.a distanceManager = playerChunkMap.chunkDistanceManager;
+ ArraySetSorted<Ticket<?>> tickets = distanceManager.tickets.get(key);
+ if ((tickets == null || tickets.isEmpty()) && !distanceManager.getLevelTracker().isChunkLoaded(key)) {
+ playerChunkMap.unloadQueue.add(key);
+ }
+ }
+ }
+ // Paper end
+
@Override
public String getName() {
return "ServerChunkCache: " + this.h();
diff --git a/src/main/java/net/minecraft/server/PlayerChunk.java b/src/main/java/net/minecraft/server/PlayerChunk.java
index b8fe42e8123e972b1ec97b048c35d90118076e66..f213a08e42db20c511f7d70434b03ee4040676bc 100644
--- a/src/main/java/net/minecraft/server/PlayerChunk.java
+++ b/src/main/java/net/minecraft/server/PlayerChunk.java
@@ -44,6 +44,8 @@ public class PlayerChunk {
long lastAutoSaveTime; // Paper - incremental autosave
long inactiveTimeStart; // Paper - incremental autosave
+ long lastActivity; // Paper - fix chunk leak
+ java.util.concurrent.ConcurrentHashMap<ChunkCoordIntPair, Boolean> dependendedOnBy = new java.util.concurrent.ConcurrentHashMap<>(); // Paper
// Paper start - optimise isOutsideOfRange
// cached here to avoid a map lookup
@@ -562,6 +564,7 @@ public class PlayerChunk {
protected void a(PlayerChunkMap playerchunkmap) {
ChunkStatus chunkstatus = getChunkStatus(this.oldTicketLevel);
ChunkStatus chunkstatus1 = getChunkStatus(this.ticketLevel);
+ if (oldTicketLevel != ticketLevel) lastActivity = chunkMap.world.getTime(); // Paper - chunk leak
boolean flag = this.oldTicketLevel <= PlayerChunkMap.GOLDEN_TICKET;
boolean flag1 = this.ticketLevel <= PlayerChunkMap.GOLDEN_TICKET; // Paper - diff on change: (flag1 = new ticket level is in loadable range)
PlayerChunk.State playerchunk_state = getChunkState(this.oldTicketLevel);
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index f42507f5a17f9388db738218f58ca76f863274ff..d4bcbf8c1030eee55064b246b25391c0a5201d83 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -639,6 +639,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
}
}));
}
+ playerchunk.lastActivity = world.getTime(); // Paper - chunk leak
ChunkStatus chunkstatus = (ChunkStatus) intfunction.apply(j1);
CompletableFuture<Either<IChunkAccess, PlayerChunk.Failure>> completablefuture = playerchunk.a(chunkstatus, this);
@@ -646,6 +647,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
if (requestingNeighbor != null && requestingNeighbor != playerchunk && !completablefuture.isDone()) {
requestingNeighbor.onNeighborRequest(playerchunk, chunkstatus);
completablefuture.thenAccept(either -> {
+ playerchunk.lastActivity = world.getTime(); // Paper - chunk leak
requestingNeighbor.onNeighborDone(playerchunk, chunkstatus, either.left().orElse(null));
});
}
@@ -871,6 +873,8 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
while (longiterator.hasNext()) { // Spigot
long j = longiterator.nextLong();
longiterator.remove(); // Spigot
+ ArraySetSorted<Ticket<?>> tickets = chunkDistanceManager.tickets.get(j); // Paper - chunk leak
+ if (tickets != null && !tickets.isEmpty()) continue; // Paper - ticket got added, don't remove
PlayerChunk playerchunk = (PlayerChunk) this.updatingChunks.remove(j);
if (playerchunk != null) {
@@ -1147,9 +1151,27 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
return completablefuture.thenComposeAsync((either) -> {
return either.map((list) -> { // Paper - Shut up.
try {
+ // Paper start
+ list.forEach(chunk -> {
+ PlayerChunk updatingChunk = getUpdatingChunk(chunk.getPos().pair());
+ if (updatingChunk != null) {
+ updatingChunk.dependendedOnBy.put(playerchunk.location, true);
+ updatingChunk.lastActivity = world.getTime();
+ }
+ });
+ // Paper end
CompletableFuture<Either<IChunkAccess, PlayerChunk.Failure>> completablefuture1 = chunkstatus.a(this.world, this.chunkGenerator, this.definedStructureManager, this.lightEngine, (ichunkaccess) -> {
return this.c(playerchunk);
}, list);
+ // Paper start
+ completablefuture1.whenComplete((unused, unused2) -> list.forEach(chunk -> {
+ PlayerChunk updatingChunk = getUpdatingChunk(chunk.getPos().pair());
+ if (updatingChunk != null) {
+ updatingChunk.dependendedOnBy.remove(playerchunk.location);
+ updatingChunk.lastActivity = world.getTime();
+ }
+ }));
+ // Paper end
this.worldLoadListener.a(chunkcoordintpair, chunkstatus);
return completablefuture1;
@@ -1167,6 +1189,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
return CompletableFuture.completedFuture(Either.right(playerchunk_failure));
});
}, (runnable) -> {
+ playerchunk.lastActivity = world.getTime(); // Paper
this.mailboxWorldGen.a(ChunkTaskQueueSorter.a(playerchunk, runnable)); // CraftBukkit - decompile error
});
}
diff --git a/src/main/java/net/minecraft/server/StructureGenerator.java b/src/main/java/net/minecraft/server/StructureGenerator.java
index acfe732af5b9f63fc2f6b78499defabe2e73ee45..25b19346fc1c702cc37275d0ec16abbbfacfb418 100644
--- a/src/main/java/net/minecraft/server/StructureGenerator.java
+++ b/src/main/java/net/minecraft/server/StructureGenerator.java
@@ -160,7 +160,7 @@ public abstract class StructureGenerator<C extends WorldGenFeatureConfiguration>
while (longiterator.hasNext()) {
long k = longiterator.nextLong();
IChunkAccess ichunkaccess1 = generatoraccess.getChunkAt(ChunkCoordIntPair.getX(k), ChunkCoordIntPair.getZ(k), ChunkStatus.STRUCTURE_STARTS, false); // CraftBukkit - don't load chunks
- StructureStart structurestart = ichunkaccess1.a(this.b());
+ StructureStart structurestart = ichunkaccess1 != null ? ichunkaccess1.a(this.b()) : null; // Paper - make sure not null
if (structurestart != null) {
list.add(structurestart);
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