Remove CraftScheduler Async Task Debugger

I have not once ever seen this system help debug a crash.
One report of a suspected memory leak with the system.

This adds additional overhead to asynchronous task dispatching

Spigot-Server-Patches/Add-exception-reporting-event.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Add exception reporting event
 
 diff --git a/src/main/java/com/destroystokyo/paper/ServerSchedulerReportingWrapper.java b/src/main/java/com/destroystokyo/paper/ServerSchedulerReportingWrapper.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
+index 000000000..93397188b
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/ServerSchedulerReportingWrapper.java
 @@ -0,0 +0,0 @@
@@ -50,7 +50,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +}
 \ No newline at end of file
 diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index e1fc4ea6c..8f1a68d67 100644
 --- a/src/main/java/net/minecraft/server/Chunk.java
 +++ b/src/main/java/net/minecraft/server/Chunk.java
 @@ -0,0 +0,0 @@
@@ -89,7 +89,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          }
      }
 diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index f7f2d12cf..b0a82e7ed 100644
 --- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
 +++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
 @@ -0,0 +0,0 @@ import java.util.Iterator;
@@ -144,7 +144,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  
      }
 diff --git a/src/main/java/net/minecraft/server/NameReferencingFileConverter.java b/src/main/java/net/minecraft/server/NameReferencingFileConverter.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 016c64e82..2ff8a6da0 100644
 --- a/src/main/java/net/minecraft/server/NameReferencingFileConverter.java
 +++ b/src/main/java/net/minecraft/server/NameReferencingFileConverter.java
 @@ -0,0 +0,0 @@
@@ -171,7 +171,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
                         }
                          // CraftBukkit end
 diff --git a/src/main/java/net/minecraft/server/PersistentCollection.java b/src/main/java/net/minecraft/server/PersistentCollection.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 936d6c640..50056f49a 100644
 --- a/src/main/java/net/minecraft/server/PersistentCollection.java
 +++ b/src/main/java/net/minecraft/server/PersistentCollection.java
 @@ -0,0 +0,0 @@
@@ -198,7 +198,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  
          }
 diff --git a/src/main/java/net/minecraft/server/RegionFile.java b/src/main/java/net/minecraft/server/RegionFile.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index b0279ac3e..be13c1131 100644
 --- a/src/main/java/net/minecraft/server/RegionFile.java
 +++ b/src/main/java/net/minecraft/server/RegionFile.java
 @@ -0,0 +0,0 @@
@@ -225,7 +225,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  
      }
 diff --git a/src/main/java/net/minecraft/server/RegionFileCache.java b/src/main/java/net/minecraft/server/RegionFileCache.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 933934fb6..19fbf9b4a 100644
 --- a/src/main/java/net/minecraft/server/RegionFileCache.java
 +++ b/src/main/java/net/minecraft/server/RegionFileCache.java
 @@ -0,0 +0,0 @@
@@ -244,7 +244,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          }
  
 diff --git a/src/main/java/net/minecraft/server/SpawnerCreature.java b/src/main/java/net/minecraft/server/SpawnerCreature.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index a05fad54f..29219ec7b 100644
 --- a/src/main/java/net/minecraft/server/SpawnerCreature.java
 +++ b/src/main/java/net/minecraft/server/SpawnerCreature.java
 @@ -0,0 +0,0 @@ import java.util.Random;
@@ -272,7 +272,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
                              }
  
 diff --git a/src/main/java/net/minecraft/server/VillageSiege.java b/src/main/java/net/minecraft/server/VillageSiege.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 7af5b7dd7..2b498024c 100644
 --- a/src/main/java/net/minecraft/server/VillageSiege.java
 +++ b/src/main/java/net/minecraft/server/VillageSiege.java
 @@ -0,0 +0,0 @@
@@ -292,7 +292,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
              }
  
 diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 8b8054ca0..b11ebed03 100644
 --- a/src/main/java/net/minecraft/server/World.java
 +++ b/src/main/java/net/minecraft/server/World.java
 @@ -0,0 +0,0 @@
@@ -328,13 +328,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
                          this.tileEntityListTick.remove(tileTickPosition--);
                          continue;
 diff --git a/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java b/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 9952b64be..e30cfb7b7 100644
 --- a/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
 +++ b/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
-@@ -0,0 +0,0 @@ import java.util.concurrent.atomic.AtomicInteger;
+@@ -0,0 +0,0 @@ import java.util.concurrent.atomic.AtomicReference;
- import java.util.concurrent.atomic.AtomicReference;
  import java.util.logging.Level;
  
+ import co.aikar.timings.MinecraftTimings; // Paper
 +import com.destroystokyo.paper.ServerSchedulerReportingWrapper;
 +import com.destroystokyo.paper.event.server.ServerExceptionEvent;
 +import com.destroystokyo.paper.exception.ServerSchedulerException;

Spigot-Server-Patches/Remove-CraftScheduler-Async-Task-Debugger.patch

@@ -0,0 +1,60 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Sun, 5 Feb 2017 00:04:04 -0500
+Subject: [PATCH] Remove CraftScheduler Async Task Debugger
+
+I have not once ever seen this system help debug a crash.
+One report of a suspected memory leak with the system.
+
+This adds additional overhead to asynchronous task dispatching
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java b/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
+index e30cfb7b7..448c27cc7 100644
+--- a/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
++++ b/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
+@@ -0,0 +0,0 @@ public class CraftScheduler implements BukkitScheduler {
+     private final ConcurrentHashMap<Integer, CraftTask> runners = new ConcurrentHashMap<Integer, CraftTask>();
+     private volatile int currentTick = -1;
+     private final Executor executor = Executors.newCachedThreadPool(new com.google.common.util.concurrent.ThreadFactoryBuilder().setNameFormat("Craft Scheduler Thread - %1$d").build()); // Spigot
+-    private CraftAsyncDebugger debugHead = new CraftAsyncDebugger(-1, null, null) {@Override StringBuilder debugTo(StringBuilder string) {return string;}};
+-    private CraftAsyncDebugger debugTail = debugHead;
++    //private CraftAsyncDebugger debugHead = new CraftAsyncDebugger(-1, null, null) {@Override StringBuilder debugTo(StringBuilder string) {return string;}}; // Paper
++    //private CraftAsyncDebugger debugTail = debugHead; // Paper
+     private static final int RECENT_TICKS;
+ 
+     static {
+@@ -0,0 +0,0 @@ public class CraftScheduler implements BukkitScheduler {
+                 }
+                 parsePending();
+             } else {
+-                debugTail = debugTail.setNext(new CraftAsyncDebugger(currentTick + RECENT_TICKS, task.getOwner(), task.getTaskClass()));
++                //debugTail = debugTail.setNext(new CraftAsyncDebugger(currentTick + RECENT_TICKS, task.getOwner(), task.getTaskClass())); // Paper
+                 executor.execute(new ServerSchedulerReportingWrapper(task)); // Paper
+                 // We don't need to parse pending
+                 // (async tasks must live with race-conditions if they attempt to cancel between these few lines of code)
+@@ -0,0 +0,0 @@ public class CraftScheduler implements BukkitScheduler {
+         pending.addAll(temp);
+         temp.clear();
+         MinecraftTimings.bukkitSchedulerFinishTimer.stopTiming();
+-        debugHead = debugHead.getNextHead(currentTick);
++        //debugHead = debugHead.getNextHead(currentTick); // Paper
+     }
+ 
+     private void addTask(final CraftTask task) {
+@@ -0,0 +0,0 @@ public class CraftScheduler implements BukkitScheduler {
+ 
+     @Override
+     public String toString() {
++        // Paper start
++        return "";
++        /*
+         int debugTick = currentTick;
+         StringBuilder string = new StringBuilder("Recent tasks from ").append(debugTick - RECENT_TICKS).append('-').append(debugTick).append('{');
+         debugHead.debugTo(string);
+         return string.append('}').toString();
++        */
++        // Paper end
+     }
+ 
+     @Deprecated
+--