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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.
24 Zeilen
1.3 KiB
Diff
24 Zeilen
1.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sat, 18 Apr 2020 15:59:41 -0400
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Subject: [PATCH] Don't crash if player is attempted to be removed from
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untracked chunk.
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I suspect it deals with teleporting as it uses players current x/y/z
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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 3d46412b307f08968bb9b96c0649e0405813462e..56aa26bb8d0bfbd3c799163fa620259e6455c89b 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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@@ -270,8 +270,8 @@ public abstract class DistanceManager {
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ObjectSet<ServerPlayer> objectset = (ObjectSet) this.playersPerChunk.get(i);
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if (objectset == null) return; // CraftBukkit - SPIGOT-6208
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- objectset.remove(player);
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- if (objectset.isEmpty()) {
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+ if (objectset != null) objectset.remove(player); // Paper - some state corruption happens here, don't crash, clean up gracefully
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+ if (objectset == null || objectset.isEmpty()) { // Paper
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this.playersPerChunk.remove(i);
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this.naturalSpawnChunkCounter.update(i, Integer.MAX_VALUE, false);
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this.playerTicketManager.update(i, Integer.MAX_VALUE, false);
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