PaperMC/Spigot-Server-Patches/Don-t-update-entity-trackers-for-worlds-without-play.patch
Shane Freeder 85e05732b2 Updated Upstream (Bukkit/CraftBukkit)
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
da08d022 SPIGOT-4700: Add PlayerFishEvent.State.REEL_IN
0cef14e4 Remove draft API from selectEntities

CraftBukkit Changes:
a46fdbc6 Remove outdated build delay.
3697519b SPIGOT-4708: Fix ExactChoice recipes neglecting material
9ead7009 SPIGOT-4677: Add minecraft.admin.command_feedback permission
c3749a23 Remove the Damage tag from items when it is 0.
f74c7b95 SPIGOT-4706: Can't interact with active item
494eef45 Mention requirement of JIRA ticket for bug fixes
51d62dec SPIGOT-4702: Exception when middle clicking certain slots
be557e69 SPIGOT-4700: Add PlayerFishEvent.State.REEL_IN
2019-04-22 22:36:14 +01:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Sun, 24 Mar 2019 18:52:31 +0000
Subject: [PATCH] Don't update entity trackers for worlds without players
PlayerList#moveToWorld already untracks the player from the player list,
meaning that we do not need to worry about this untracking players
who've left the world, The server also untracks a player during
disconnect, handing yet another case.
If we don't need to untrack players who've left the world, it should be
reasonably save to do this, as we're not going to be performing any
server->client updates here, which is what this code is intended to do,
and all players should be untracked.
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index ce39ea09e8..b93fccf919 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -0,0 +0,0 @@ public abstract class MinecraftServer implements IAsyncTaskHandler, IMojangStati
this.methodProfiler.exit();
this.methodProfiler.enter("tracker");
- worldserver.getTracker().updatePlayers();
+ if (playerList.players.size() > 0) worldserver.getTracker().updatePlayers(); // Paper - No players, why spend time tracking them? (See patch)
this.methodProfiler.exit();
this.methodProfiler.exit();
worldserver.explosionDensityCache.clear(); // Paper - Optimize explosions
--