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https://github.com/PaperMC/Paper.git
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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.
80 lines
5.9 KiB
Diff
80 lines
5.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <spottedleaf@spottedleaf.dev>
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Date: Thu, 18 Jun 2020 18:23:20 -0700
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Subject: [PATCH] Prevent unload() calls removing tickets for sync loads
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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 b2df5e18ce5260a9781052db7afb0b9786fb887c..537d34a0325a985948c744929b90144a66a35ee3 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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@@ -545,7 +545,7 @@ public abstract class DistanceManager {
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}
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public void removeTicketsOnClosing() {
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- ImmutableSet<TicketType<?>> immutableset = ImmutableSet.of(TicketType.UNKNOWN, TicketType.POST_TELEPORT, TicketType.LIGHT, TicketType.FUTURE_AWAIT, TicketType.ASYNC_LOAD); // Paper - add additional tickets to preserve
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+ ImmutableSet<TicketType<?>> immutableset = ImmutableSet.of(TicketType.UNKNOWN, TicketType.POST_TELEPORT, TicketType.LIGHT, TicketType.FUTURE_AWAIT, TicketType.ASYNC_LOAD, TicketType.REQUIRED_LOAD); // Paper - add additional tickets to preserve
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ObjectIterator objectiterator = this.tickets.long2ObjectEntrySet().fastIterator();
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while (objectiterator.hasNext()) {
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diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
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index 29ba8971ceffbac68290f6063a69c98065e9bcba..2390fcbc1b21653b1753a58da33f936cec43d0cb 100644
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--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
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+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
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@@ -537,6 +537,8 @@ public class ServerChunkCache extends ChunkSource {
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return completablefuture;
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}
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+ private long syncLoadCounter; // Paper - prevent plugin unloads from removing our ticket
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+
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private CompletableFuture<Either<ChunkAccess, ChunkHolder.ChunkLoadingFailure>> getChunkFutureMainThread(int chunkX, int chunkZ, ChunkStatus leastStatus, boolean create) {
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// Paper start - add isUrgent - old sig left in place for dirty nms plugins
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return getChunkFutureMainThread(chunkX, chunkZ, leastStatus, create, false);
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@@ -555,9 +557,12 @@ public class ServerChunkCache extends ChunkSource {
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ChunkHolder.FullChunkStatus currentChunkState = ChunkHolder.getFullChunkStatus(playerchunk.getTicketLevel());
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currentlyUnloading = (oldChunkState.isOrAfter(ChunkHolder.FullChunkStatus.BORDER) && !currentChunkState.isOrAfter(ChunkHolder.FullChunkStatus.BORDER));
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}
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+ final Long identifier; // Paper - prevent plugin unloads from removing our ticket
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if (create && !currentlyUnloading) {
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// CraftBukkit end
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this.distanceManager.addTicket(TicketType.UNKNOWN, chunkcoordintpair, l, chunkcoordintpair);
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+ identifier = Long.valueOf(this.syncLoadCounter++); // Paper - prevent plugin unloads from removing our ticket
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+ this.distanceManager.addTicket(TicketType.REQUIRED_LOAD, chunkcoordintpair, l, identifier); // Paper - prevent plugin unloads from removing our ticket
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if (isUrgent) this.distanceManager.markUrgent(chunkcoordintpair); // Paper - Chunk priority
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if (this.chunkAbsent(playerchunk, l)) {
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ProfilerFiller gameprofilerfiller = this.level.getProfiler();
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@@ -568,13 +573,21 @@ public class ServerChunkCache extends ChunkSource {
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playerchunk = this.getVisibleChunkIfPresent(k);
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gameprofilerfiller.pop();
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if (this.chunkAbsent(playerchunk, l)) {
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+ this.distanceManager.removeTicket(TicketType.REQUIRED_LOAD, chunkcoordintpair, l, identifier); // Paper
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throw (IllegalStateException) Util.pauseInIde(new IllegalStateException("No chunk holder after ticket has been added"));
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}
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}
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- }
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+ } else { identifier = null; } // Paper - prevent plugin unloads from removing our ticket
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// Paper start - Chunk priority
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CompletableFuture<Either<ChunkAccess, ChunkHolder.ChunkLoadingFailure>> future = this.chunkAbsent(playerchunk, l) ? ChunkHolder.UNLOADED_CHUNK_FUTURE : playerchunk.getOrScheduleFuture(leastStatus, this.chunkMap);
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+ // Paper start - prevent plugin unloads from removing our ticket
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+ if (create && !currentlyUnloading) {
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+ future.thenAcceptAsync((either) -> {
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+ ServerChunkCache.this.distanceManager.removeTicket(TicketType.REQUIRED_LOAD, chunkcoordintpair, l, identifier);
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+ }, ServerChunkCache.this.mainThreadProcessor);
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+ }
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+ // Paper end - prevent plugin unloads from removing our ticket
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if (isUrgent) {
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future.thenAccept(either -> this.distanceManager.clearUrgent(chunkcoordintpair));
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}
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diff --git a/src/main/java/net/minecraft/server/level/TicketType.java b/src/main/java/net/minecraft/server/level/TicketType.java
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index 3c1698ba0d3bc412ab957777d9b5211dbc555208..41ddcf6775f99c56cf4b13b284420061e5dd6bdc 100644
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--- a/src/main/java/net/minecraft/server/level/TicketType.java
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+++ b/src/main/java/net/minecraft/server/level/TicketType.java
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@@ -31,6 +31,7 @@ public class TicketType<T> {
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public static final TicketType<Unit> PLUGIN = TicketType.create("plugin", (a, b) -> 0); // CraftBukkit
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public static final TicketType<org.bukkit.plugin.Plugin> PLUGIN_TICKET = TicketType.create("plugin_ticket", (plugin1, plugin2) -> plugin1.getClass().getName().compareTo(plugin2.getClass().getName())); // CraftBukkit
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public static final TicketType<Long> DELAY_UNLOAD = create("delay_unload", Long::compareTo, 300); // Paper
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+ public static final TicketType<Long> REQUIRED_LOAD = create("required_load", Long::compareTo); // Paper - make sure getChunkAt does not fail
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public static <T> TicketType<T> create(String name, Comparator<T> argumentComparator) {
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return new TicketType<>(name, argumentComparator, 0L);
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