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c5a10665b8
Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
40 lines
2.5 KiB
Diff
40 lines
2.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: etil2jz <blanchot.arthur@protonmail.ch>
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Date: Sat, 2 Apr 2022 23:29:24 +0200
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Subject: [PATCH] Fix NBT pieces overriding a block entity during worldgen
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deadlock
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By checking if the world passed into StructureTemplate's placeInWorld
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is not a WorldGenRegion, we can bypass the deadlock entirely.
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See https://bugs.mojang.com/browse/MC-246262
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diff --git a/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java b/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
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index 33564e62e3181d28b18a957e28b8ec5152d8339f..cf8258e8d46ca7286a66c38fa24af369bd9a279f 100644
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--- a/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
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+++ b/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
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@@ -279,7 +279,11 @@ public class StructureTemplate {
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if (definedstructure_blockinfo.nbt != null) {
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tileentity = world.getBlockEntity(blockposition2);
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- Clearable.tryClear(tileentity);
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+ // Paper start - Fix NBT pieces overriding a block entity during worldgen deadlock
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+ if (!(world instanceof net.minecraft.world.level.WorldGenLevel)) {
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+ Clearable.tryClear(tileentity);
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+ }
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+ // Paper end - Fix NBT pieces overriding a block entity during worldgen deadlock
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world.setBlock(blockposition2, Blocks.BARRIER.defaultBlockState(), 20);
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}
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// CraftBukkit start
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@@ -406,7 +410,11 @@ public class StructureTemplate {
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if (pair1.getSecond() != null) {
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tileentity = world.getBlockEntity(blockposition6);
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if (tileentity != null) {
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- tileentity.setChanged();
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+ // Paper start - Fix NBT pieces overriding a block entity during worldgen deadlock
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+ if (!(world instanceof net.minecraft.world.level.WorldGenLevel)) {
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+ tileentity.setChanged();
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+ }
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+ // Paper end - Fix NBT pieces overriding a block entity during worldgen deadlock
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}
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}
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}
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