From c971a6e41bce603b22ca19f912e833b0fd0cce9d Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 3 Nov 2016 21:52:22 -0400
Subject: [PATCH] Prevent Auto Save if Save Queue is full

If the save queue already has 50 (configurable) of chunks pending,
then avoid processing auto save (which would add more)

diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index d9f5ead011..656ecdacaf 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -325,6 +325,11 @@ public class PaperWorldConfig {
         maxAutoSaveChunksPerTick = getInt("max-auto-save-chunks-per-tick", 24);
     }
 
+    public int queueSizeAutoSaveThreshold = 50;
+    private void queueSizeAutoSaveThreshold() {
+        queueSizeAutoSaveThreshold = getInt("save-queue-limit-for-auto-save", 50);
+    }
+
     public boolean removeCorruptTEs = false;
     private void removeCorruptTEs() {
         removeCorruptTEs = getBoolean("remove-corrupt-tile-entities", false);
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index a35eac043c..8acbd7bbff 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -234,6 +234,13 @@ public class ChunkProviderServer implements IChunkProvider {
         synchronized (this.chunkLoader) {
             ObjectIterator objectiterator = this.chunks.values().iterator();
 
+            // Paper start
+            final ChunkRegionLoader chunkLoader = (ChunkRegionLoader) world.getChunkProviderServer().chunkLoader;
+            final int queueSize = chunkLoader.getQueueSize();
+            if (queueSize > world.paperConfig.queueSizeAutoSaveThreshold){
+                return false;
+            }
+            // Paper end
             while (objectiterator.hasNext()) {
                 Chunk chunk = (Chunk) objectiterator.next();
 
diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
index d40d9d1173..fc8f7574cf 100644
--- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java
+++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
@@ -148,6 +148,8 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
 
     }
 
+    public int getQueueSize() { return queue.size(); } // Paper
+
     // CraftBukkit start - Add async variant, provide compatibility
     @Nullable
     public Chunk a(GeneratorAccess generatoraccess, int i, int j, Consumer<Chunk> consumer) throws IOException {
-- 
2.19.0