Paper/patches/server/0391-Don-t-move-existing-players-to-world-spawn.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 9 Apr 2020 21:20:33 -0400
Subject: [PATCH] Don't move existing players to world spawn
This can cause a nasty server lag the spawn chunks are not kept loaded
or they aren't finished loading yet, or if the world spawn radius is
larger than the keep loaded range.
By skipping this, we avoid potential for a large spike on server start.
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
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index fd609c7b757b570206c17444867f786c1767aa69..d507adcb538933fcf36e9a4bfb561106d509c26f 100644
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--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
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@@ -313,7 +313,7 @@ public class ServerPlayer extends Player {
this.stats = server.getPlayerList().getPlayerStats(this);
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this.advancements = server.getPlayerList().getPlayerAdvancements(this);
this.maxUpStep = 1.0F;
- this.fudgeSpawnLocation(world);
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+ //this.fudgeSpawnLocation(world); // Paper - don't move to spawn on login, only first join
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this.cachedSingleHashSet = new com.destroystokyo.paper.util.misc.PooledLinkedHashSets.PooledObjectLinkedOpenHashSet<>(this); // Paper
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@@ -531,7 +531,7 @@ public class ServerPlayer extends Player {
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position = Vec3.atCenterOf(((ServerLevel) world).getSharedSpawnPos());
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}
this.level = world;
- this.setPos(position.x(), position.y(), position.z());
+ this.setPosRaw(position.x(), position.y(), position.z()); // Paper - don't register to chunks yet
}
this.gameMode.setLevel((ServerLevel) world);
}
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index 2458619f7f377398322459e00a49f7f49437f9a2..362fe0c88021c4530110d1128819016c8ae9c0d5 100644
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--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
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@@ -210,6 +210,8 @@ public abstract class PlayerList {
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worldserver1 = worldserver;
}
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+ if (nbttagcompound == null) player.fudgeSpawnLocation(worldserver1); // Paper - only move to spawn on first login, otherwise, stay where you are....
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+
player.setLevel(worldserver1);
String s1 = "local";
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