Remove wall-time / unused skip tick protection (#11412)
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.
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794 changed files with 402 additions and 282 deletions
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@ -170,7 +170,7 @@ index 0000000000000000000000000000000000000000..30a19d10869f73d67b794e8e4c035bc5
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+
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+}
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diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index e464349a46eab23eb5b8d4d31f577d78532b3ce1..7f4c9ba88c2d33c2cc23e406a616f9eb35d738ce 100644
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index 5d03477919ce892f6dfb4b2304c03733e10e3721..cc0968182ab597892dbae8dd9b3e803fb62b7065 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
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+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -3,6 +3,9 @@ package net.minecraft.server;
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@ -183,7 +183,7 @@ index e464349a46eab23eb5b8d4d31f577d78532b3ce1..7f4c9ba88c2d33c2cc23e406a616f9eb
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import com.google.common.collect.Lists;
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import com.google.common.collect.Maps;
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import com.google.common.collect.Sets;
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@@ -1517,7 +1520,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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@@ -1515,7 +1518,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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if (this.hidesOnlinePlayers()) {
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return new ServerStatus.Players(i, list.size(), List.of());
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} else {
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