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01a13871de
Patch documentation to come Issues with the old system that are fixed now: - World generation does not scale with cpu cores effectively. - Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps. - Unreliable prioritisation of chunk gen/load calls that block the main thread. - Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved. - Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal. - Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles. The above list is not complete. The patch documentation will complete it. New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil. Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft. The old legacy chunk system patches have been moved to the removed folder in case we need them again.
85 lines
4.2 KiB
Diff
85 lines
4.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Shane Freeder <theboyetronic@gmail.com>
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Date: Wed, 29 May 2019 04:01:22 +0100
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Subject: [PATCH] ChunkMapDistance CME
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diff --git a/src/main/java/net/minecraft/server/level/ChunkHolder.java b/src/main/java/net/minecraft/server/level/ChunkHolder.java
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index 0873134f1f6de0c372ba28b89a20302c9a0115d8..e30893d6cbe3b42338d04453d0f452babeb61d8a 100644
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--- a/src/main/java/net/minecraft/server/level/ChunkHolder.java
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+++ b/src/main/java/net/minecraft/server/level/ChunkHolder.java
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@@ -73,6 +73,7 @@ public class ChunkHolder {
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private boolean resendLight;
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private CompletableFuture<Void> pendingFullStateConfirmation;
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+ boolean isUpdateQueued = false; // Paper
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private final ChunkMap chunkMap; // Paper
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// Paper start
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diff --git a/src/main/java/net/minecraft/server/level/DistanceManager.java b/src/main/java/net/minecraft/server/level/DistanceManager.java
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index f08089b8672454acf8c2309e850466b335248692..6181f675d7addde30f7018b4cd46fe061a14da51 100644
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--- a/src/main/java/net/minecraft/server/level/DistanceManager.java
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+++ b/src/main/java/net/minecraft/server/level/DistanceManager.java
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@@ -52,7 +52,16 @@ public abstract class DistanceManager {
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private final DistanceManager.FixedPlayerDistanceChunkTracker naturalSpawnChunkCounter = new DistanceManager.FixedPlayerDistanceChunkTracker(8);
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private final TickingTracker tickingTicketsTracker = new TickingTracker();
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private final DistanceManager.PlayerTicketTracker playerTicketManager = new DistanceManager.PlayerTicketTracker(33);
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- final Set<ChunkHolder> chunksToUpdateFutures = Sets.newHashSet();
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+ // Paper start use a queue, but still keep unique requirement
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+ public final java.util.Queue<ChunkHolder> pendingChunkUpdates = new java.util.ArrayDeque<ChunkHolder>() {
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+ @Override
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+ public boolean add(ChunkHolder o) {
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+ if (o.isUpdateQueued) return true;
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+ o.isUpdateQueued = true;
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+ return super.add(o);
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+ }
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+ };
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+ // Paper end
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final ChunkTaskPriorityQueueSorter ticketThrottler;
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final ProcessorHandle<ChunkTaskPriorityQueueSorter.Message<Runnable>> ticketThrottlerInput;
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final ProcessorHandle<ChunkTaskPriorityQueueSorter.Release> ticketThrottlerReleaser;
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@@ -127,26 +136,14 @@ public abstract class DistanceManager {
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;
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}
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- if (!this.chunksToUpdateFutures.isEmpty()) {
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- // CraftBukkit start
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- // Iterate pending chunk updates with protection against concurrent modification exceptions
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- java.util.Iterator<ChunkHolder> iter = this.chunksToUpdateFutures.iterator();
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- int expectedSize = this.chunksToUpdateFutures.size();
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- do {
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- ChunkHolder playerchunk = iter.next();
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- iter.remove();
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- expectedSize--;
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-
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- playerchunk.updateFutures(chunkStorage, this.mainThreadExecutor);
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-
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- // Reset iterator if set was modified using add()
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- if (this.chunksToUpdateFutures.size() != expectedSize) {
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- expectedSize = this.chunksToUpdateFutures.size();
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- iter = this.chunksToUpdateFutures.iterator();
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- }
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- } while (iter.hasNext());
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- // CraftBukkit end
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-
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+ // Paper start
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+ if (!this.pendingChunkUpdates.isEmpty()) {
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+ while(!this.pendingChunkUpdates.isEmpty()) {
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+ ChunkHolder remove = this.pendingChunkUpdates.remove();
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+ remove.isUpdateQueued = false;
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+ remove.updateFutures(chunkStorage, this.mainThreadExecutor);
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+ }
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+ // Paper end
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return true;
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} else {
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if (!this.ticketsToRelease.isEmpty()) {
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@@ -471,7 +468,7 @@ public abstract class DistanceManager {
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if (k != level) {
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playerchunk = DistanceManager.this.updateChunkScheduling(id, level, playerchunk, k);
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if (playerchunk != null) {
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- DistanceManager.this.chunksToUpdateFutures.add(playerchunk);
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+ DistanceManager.this.pendingChunkUpdates.add(playerchunk);
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}
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}
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