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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.
69 lines
3.2 KiB
Diff
69 lines
3.2 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: Fri, 3 Sep 2021 15:50:25 +0100
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Subject: [PATCH] Do not process entity loads in CraftChunk#getEntities
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This re-introduces the issue behind #5872 but fixes #6543
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The logic here is generally flawed however somewhat of a nuance,
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upstream uses managedBlock which is basically needed to process
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the posted entity adds, but, has the side-effect of processing any
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chunk loads which has the naunce of stacking up and either causing a
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massive performance hit, or can potentially lead the server to crash.
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This issue is particularly noticable on paper due to the cumulative efforts
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to drastically improve chunk loading speeds which means that there is much more
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of a chance that we're about to eat a dirtload of chunk load callbacks, thus
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making this issue much more of an issue
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
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index 2224b9cfbc3be59037ef49ce278989ea3a710bb5..0b9312dc5ee43d2d450dc6e9f07a9ac0320955ca 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
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@@ -130,46 +130,6 @@ public class CraftChunk implements Chunk {
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this.getWorld().getChunkAt(x, z); // Transient load for this tick
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}
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- PersistentEntitySectionManager<net.minecraft.world.entity.Entity> entityManager = this.getCraftWorld().getHandle().entityManager;
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- long pair = ChunkPos.asLong(x, z);
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-
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- if (entityManager.areEntitiesLoaded(pair)) {
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- return getCraftWorld().getHandle().getChunkEntities(this.x, this.z); // Paper - optimise this
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- }
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-
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- entityManager.ensureChunkQueuedForLoad(pair); // Start entity loading
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-
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- // SPIGOT-6772: Use entity mailbox and re-schedule entities if they get unloaded
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- ProcessorMailbox<Runnable> mailbox = ((EntityStorage) entityManager.permanentStorage).entityDeserializerQueue;
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- BooleanSupplier supplier = () -> {
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- // only execute inbox if our entities are not present
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- if (entityManager.areEntitiesLoaded(pair)) {
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- return true;
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- }
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-
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- if (!entityManager.isPending(pair)) {
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- // Our entities got unloaded, this should normally not happen.
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- entityManager.ensureChunkQueuedForLoad(pair); // Re-start entity loading
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- }
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-
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- // tick loading inbox, which loads the created entities to the world
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- // (if present)
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- entityManager.tick();
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- // check if our entities are loaded
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- return entityManager.areEntitiesLoaded(pair);
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- };
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-
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- // now we wait until the entities are loaded,
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- // the converting from NBT to entity object is done on the main Thread which is why we wait
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- while (!supplier.getAsBoolean()) {
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- if (mailbox.size() != 0) {
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- mailbox.run();
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- } else {
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- Thread.yield();
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- LockSupport.parkNanos("waiting for entity loading", 100000L);
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- }
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- }
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-
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return getCraftWorld().getHandle().getChunkEntities(this.x, this.z); // Paper - optimise this
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}
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