From b232efe9bd3523537d680cca1176dc07cc4adc8c Mon Sep 17 00:00:00 2001 From: miclebrick Date: Wed, 8 Aug 2018 15:30:52 -0400 Subject: [PATCH] Add Early Warning Feature to WatchDog Detect when the server has been hung for a long duration, and start printing thread dumps at an interval until the point of crash. This will help diagnose what was going on in that time before the crash. diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java index 046bf33f66..8f12ad850b 100644 --- a/src/main/java/com/destroystokyo/paper/PaperConfig.java +++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java @@ -24,6 +24,8 @@ import org.bukkit.configuration.InvalidConfigurationException; import org.bukkit.configuration.file.YamlConfiguration; import co.aikar.timings.Timings; import co.aikar.timings.TimingsManager; +import org.spigotmc.SpigotConfig; +import org.spigotmc.WatchdogThread; public class PaperConfig { @@ -341,4 +343,12 @@ public class PaperConfig { } tabSpamLimit = getInt("settings.spam-limiter.tab-spam-limit", tabSpamLimit); } + + public static int watchdogPrintEarlyWarningEvery = 5000; + public static int watchdogPrintEarlyWarningDelay = 10000; + private static void watchdogEarlyWarning() { + watchdogPrintEarlyWarningEvery = getInt("settings.watchdog.early-warning-every", 5000); + watchdogPrintEarlyWarningDelay = getInt("settings.watchdog.early-warning-delay", 10000); + WatchdogThread.doStart(SpigotConfig.timeoutTime, SpigotConfig.restartOnCrash ); + } } diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java index 74c97b5db6..da2e84c6b8 100644 --- a/src/main/java/net/minecraft/server/MinecraftServer.java +++ b/src/main/java/net/minecraft/server/MinecraftServer.java @@ -768,6 +768,7 @@ public abstract class MinecraftServer implements IAsyncTaskHandler, IMojangStati this.a(this.n); // Spigot start + org.spigotmc.WatchdogThread.hasStarted = true; Arrays.fill( recentTps, 20 ); long start = System.nanoTime(), lastTick = start - TICK_TIME, catchupTime = 0, curTime, wait, tickSection = start; // Paper - Further improve server tick loop while (this.isRunning) { diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java index 4ac0ab9974..0c45d75adf 100644 --- a/src/main/java/org/spigotmc/SpigotConfig.java +++ b/src/main/java/org/spigotmc/SpigotConfig.java @@ -226,7 +226,7 @@ public class SpigotConfig restartScript = getString( "settings.restart-script", restartScript ); restartMessage = transform( getString( "messages.restart", "Server is restarting" ) ); commands.put( "restart", new RestartCommand( "restart" ) ); - WatchdogThread.doStart( timeoutTime, restartOnCrash ); + //WatchdogThread.doStart( timeoutTime, restartOnCrash ); // Paper - moved to PaperConfig } public static boolean bungee; diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java index 57a4748a30..2aff1039ad 100644 --- a/src/main/java/org/spigotmc/WatchdogThread.java +++ b/src/main/java/org/spigotmc/WatchdogThread.java @@ -5,6 +5,7 @@ import java.lang.management.MonitorInfo; import java.lang.management.ThreadInfo; import java.util.logging.Level; import java.util.logging.Logger; +import com.destroystokyo.paper.PaperConfig; import net.minecraft.server.MinecraftServer; import org.bukkit.Bukkit; @@ -13,6 +14,10 @@ public class WatchdogThread extends Thread private static WatchdogThread instance; private final long timeoutTime; + private final long earlyWarningEvery; // Paper - Timeout time for just printing a dump but not restarting + private final long earlyWarningDelay; // Paper + public static volatile boolean hasStarted; // Paper + private long lastEarlyWarning; // Paper - Keep track of short dump times to avoid spamming console with short dumps private final boolean restart; private volatile long lastTick; private volatile boolean stopping; @@ -22,6 +27,8 @@ public class WatchdogThread extends Thread super( "Paper Watchdog Thread" ); this.timeoutTime = timeoutTime; this.restart = restart; + earlyWarningEvery = Math.min(PaperConfig.watchdogPrintEarlyWarningEvery, timeoutTime); // Paper + earlyWarningDelay = Math.min(PaperConfig.watchdogPrintEarlyWarningDelay, timeoutTime); // Paper } public static void doStart(int timeoutTime, boolean restart) @@ -52,9 +59,19 @@ 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 + earlyWarningEvery && !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 && (earlyWarningEvery <= 0 || !hasStarted || currentTime < lastEarlyWarning + earlyWarningEvery || currentTime < lastTick + earlyWarningDelay)) continue; + lastEarlyWarning = 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 +96,19 @@ public class WatchdogThread extends Thread } } // Paper end + } else + { + log.log( Level.SEVERE, "The server has not responded for " + earlyWarningEvery / 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 +122,12 @@ 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