From a30613e82fe3e0e0759e03c7d6b4b69d60e005f0 Mon Sep 17 00:00:00 2001
From: miclebrick <miclebrick@outlook.com>
Date: Wed, 8 Aug 2018 15:30:52 -0400
Subject: [PATCH] Add 5 second short dumps to watchdog


diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java
index 57a4748a3..815c3e664 100644
--- a/src/main/java/org/spigotmc/WatchdogThread.java
+++ b/src/main/java/org/spigotmc/WatchdogThread.java
@@ -13,8 +13,10 @@ public class WatchdogThread extends Thread
 
     private static WatchdogThread instance;
     private final long timeoutTime;
+    private final long shortTimeout; // Paper - Timeout time for just printing a dump but not restarting
     private final boolean restart;
     private volatile long lastTick;
+    private long lastShortDump; // Paper - Keep track of short dump times to avoid spamming console with short dumps
     private volatile boolean stopping;
 
     private WatchdogThread(long timeoutTime, boolean restart)
@@ -22,6 +24,7 @@ public class WatchdogThread extends Thread
         super( "Paper Watchdog Thread" );
         this.timeoutTime = timeoutTime;
         this.restart = restart;
+        shortTimeout = Math.min(5000, timeoutTime); // Paper - Make short timeout the lower of 5 seconds, and timeout time
     }
 
     public static void doStart(int timeoutTime, boolean restart)
@@ -52,9 +55,19 @@ public class WatchdogThread extends Thread
         while ( !stopping )
         {
             //
-            if ( lastTick != 0 && System.currentTimeMillis() > lastTick + timeoutTime && !Boolean.getBoolean("disable.watchdog")) // Paper - Add property to disable
+            long currentTime = System.currentTimeMillis(); // Paper - do we REALLY need to call this method multiple times?
+            if ( lastTick != 0 && currentTime > lastTick + shortTimeout && !Boolean.getBoolean("disable.watchdog") ) // Paper - Add property to disable and short timeout
             {
+                // Paper start
+                boolean isLongTimeout = currentTime > lastTick + timeoutTime;
+                // Don't spam short dumps
+                if ( !isLongTimeout && currentTime < lastShortDump + shortTimeout ) continue;
+                lastShortDump = currentTime;
+                // Paper end
                 Logger log = Bukkit.getServer().getLogger();
+                // Paper start - Different message when it's a short timeout
+                if ( isLongTimeout )
+                {
                 log.log( Level.SEVERE, "The server has stopped responding!" );
                 log.log( Level.SEVERE, "Please report this to https://github.com/PaperMC/Paper/issues" );
                 log.log( Level.SEVERE, "Be sure to include ALL relevant console errors and Minecraft crash reports" );
@@ -79,11 +92,19 @@ public class WatchdogThread extends Thread
                     }
                 }
                 // Paper end
+                } else
+                {
+                    log.log( Level.SEVERE, "The server has not responded for " + shortTimeout / 1000 + " seconds! Creating thread dump");
+                }
+                // Paper end - Different message for short timeout
                 log.log( Level.SEVERE, "------------------------------" );
                 log.log( Level.SEVERE, "Server thread dump (Look for plugins here before reporting to Paper!):" );
                 dumpThread( ManagementFactory.getThreadMXBean().getThreadInfo( MinecraftServer.getServer().primaryThread.getId(), Integer.MAX_VALUE ), log );
                 log.log( Level.SEVERE, "------------------------------" );
                 //
+                // Paper start - Only print full dump on long timeouts
+                if ( isLongTimeout )
+                {
                 log.log( Level.SEVERE, "Entire Thread Dump:" );
                 ThreadInfo[] threads = ManagementFactory.getThreadMXBean().dumpAllThreads( true, true );
                 for ( ThreadInfo thread : threads )
@@ -97,11 +118,12 @@ public class WatchdogThread extends Thread
                     RestartCommand.restart();
                 }
                 break;
+                } // Paper end
             }
 
             try
             {
-                sleep( 10000 );
+                sleep( 1000 ); // Paper - Reduce check time to every second instead of every ten seconds, more consistent and allows for short timeout
             } catch ( InterruptedException ex )
             {
                 interrupt();
-- 
2.18.0