From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 8 Apr 2020 21:24:05 -0400
Subject: [PATCH] Increase Light Queue Size

Wiz mentioned that large WorldEdit operations cause light to run on
main thread. The queue was small, set to 5.. this bumps it to 20
but makes it configurable per-world.

The main risk of increasing this higher is during shutdown, some
queued light updates may be lost because mojang did not flush the
light engine on shutdown...

The queue size only puts a cap on max loss, doesn't solve that problem.

diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 3a085c141a5a6e2df9a85d0e3969363d69824294..27f19abc22e295a5480dbed5df86f5d885ad3b73 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -780,7 +780,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         this.executeModerately();
         // CraftBukkit end
         if (worldserver.getWorld().getKeepSpawnInMemory()) worldloadlistener.stop(); // Paper
-        chunkproviderserver.getLightEngine().setTaskPerBatch(5);
+        chunkproviderserver.getLightEngine().setTaskPerBatch(worldserver.paperConfig().misc.lightQueueSize); // Paper - increase light queue size
         // CraftBukkit start
         // this.updateMobSpawningFlags();
         worldserver.setSpawnSettings(this.isSpawningMonsters(), this.isSpawningAnimals());