From f740ce691e50b45b0fb0b729ce92c5e1ead81226 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Wed, 29 May 2019 04:01:22 +0100
Subject: [PATCH] ChunkMapDistance CME


diff --git a/src/main/java/net/minecraft/server/ChunkMapDistance.java b/src/main/java/net/minecraft/server/ChunkMapDistance.java
index 101eb58ac..63a688725 100644
--- a/src/main/java/net/minecraft/server/ChunkMapDistance.java
+++ b/src/main/java/net/minecraft/server/ChunkMapDistance.java
@@ -36,7 +36,7 @@ public abstract class ChunkMapDistance {
     private final ChunkMapDistance.a e = new ChunkMapDistance.a();
     private final ChunkMapDistance.b f = new ChunkMapDistance.b(8);
     private final ChunkMapDistance.c g = new ChunkMapDistance.c(33);
-    private final Set<PlayerChunk> pendingChunkUpdates = Sets.newHashSet();
+    private final java.util.Queue<PlayerChunk> pendingChunkUpdates = new java.util.LinkedList<>(); // PAIL pendingChunkUpdates // Paper - use a queue
     private final ChunkTaskQueueSorter i;
     private final Mailbox<ChunkTaskQueueSorter.a<Runnable>> j;
     private final Mailbox<ChunkTaskQueueSorter.b> k;
@@ -99,26 +99,12 @@ public abstract class ChunkMapDistance {
             ;
         }
 
+        // Paper start
         if (!this.pendingChunkUpdates.isEmpty()) {
-            // CraftBukkit start
-            // Iterate pending chunk updates with protection against concurrent modification exceptions
-            java.util.Iterator<PlayerChunk> iter = this.pendingChunkUpdates.iterator();
-            int expectedSize = this.pendingChunkUpdates.size();
-            do {
-                PlayerChunk playerchunk = iter.next();
-                iter.remove();
-                expectedSize--;
-
-                playerchunk.a(playerchunkmap);
-
-                // Reset iterator if set was modified using add()
-                if (this.pendingChunkUpdates.size() != expectedSize) {
-                    expectedSize = this.pendingChunkUpdates.size();
-                    iter = this.pendingChunkUpdates.iterator();
-                }
-            } while (iter.hasNext());
-            // CraftBukkit end
-
+            while(!this.pendingChunkUpdates.isEmpty()) {
+                this.pendingChunkUpdates.remove().a(playerchunkmap);
+            }
+            // Paper end
             return true;
         } else {
             if (!this.l.isEmpty()) {
-- 
2.23.0