6f2009754d
At the time this was re-added, there was concern around how the JIT would handle the system property that enabled it. This shouldn't be a problem, and as such we no longer need to block access to it. The Vanilla Method Profiler will not provide much to most users however there is no harm in providing it as an option. For most users, the recommended and supported method for determining performance issues with Paper will continue to be Timings.
310 lines
12 KiB
Diff
310 lines
12 KiB
Diff
From fa9d2a8159458408c68c6b1b56f12ae0a590e66b Mon Sep 17 00:00:00 2001
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From: Zach Brown <zach.brown@destroystokyo.com>
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Date: Fri, 12 May 2017 23:34:11 -0500
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Subject: [PATCH] Properly handle async calls to restart the server
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The watchdog thread calls the server restart function asynchronously. Prior to
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this change, it attempted to do several non-safe operations from the watchdog
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thread, rather than the main. Specifically, because of a separate upstream change,
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it causes player entities to be ticked asynchronously, among other things.
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This is dangerous.
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This patch moves the old handling into a synchronous variant, for calls from the
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restart command, and adds separate handling for async calls, such as those from
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the watchdog thread.
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When calling from the watchdog thread, we cannot assume the main thread is in a
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tickable state; it may be completely deadlocked. In order to handle this, we mark
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the server as stopping, in order to account for situations where the server should
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complete a tick reasonbly soon, i.e. 99% of cases.
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Should the server not enter a state where it is stopping within 10 seconds, We
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will assume that the server has in fact deadlocked and will proceed to force
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kill the server.
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This modification does not force restart the server should we actually enter a
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deadlocked state where the server is stopping, whereas this will in most cases
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exit within a reasonable amount of time, to put a fixed limit on a process that
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will have plugins and worlds saving to the disk has a high potential to result
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in corruption/dataloss.
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diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index 13c6b5cc..908a5d27 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
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+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -71,6 +71,7 @@ public abstract class MinecraftServer implements ICommandListener, Runnable, IAs
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public WorldServer[] worldServer;
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private PlayerList v;
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private boolean isRunning = true;
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+ private boolean isRestarting = false; // Paper - flag to signify we're attempting to restart
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private boolean isStopped;
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private int ticks;
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protected final Proxy e;
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@@ -489,7 +490,7 @@ public abstract class MinecraftServer implements ICommandListener, Runnable, IAs
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if (this.v != null) {
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MinecraftServer.LOGGER.info("Saving players");
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this.v.savePlayers();
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- this.v.u();
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+ this.v.u(isRestarting);
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try { Thread.sleep(100); } catch (InterruptedException ex) {} // CraftBukkit - SPIGOT-625 - give server at least a chance to send packets
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}
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@@ -546,10 +547,18 @@ public abstract class MinecraftServer implements ICommandListener, Runnable, IAs
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return this.isRunning;
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}
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+ // Paper start - allow passing of the intent to restart
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public void safeShutdown() {
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+ safeShutdown(false);
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+ }
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+
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+ public void safeShutdown(boolean isRestarting) {
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this.isRunning = false;
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+ this.isRestarting = isRestarting;
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}
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+ // Paper end
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+
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// Paper start - Further improve server tick loop
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private static final int TPS = 20;
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private static final long SEC_IN_NANO = 1000000000;
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@@ -1615,6 +1624,7 @@ public abstract class MinecraftServer implements ICommandListener, Runnable, IAs
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return this.ab;
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}
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+ public final Thread getServerThread() { return this.aI(); } // Paper - OBFHELPER
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public Thread aI() {
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return this.serverThread;
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}
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diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java
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index 054483a7..fbbb4e73 100644
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--- a/src/main/java/net/minecraft/server/PlayerList.java
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+++ b/src/main/java/net/minecraft/server/PlayerList.java
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@@ -1378,10 +1378,15 @@ public abstract class PlayerList {
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entityplayer.playerInteractManager.b(world.getWorldData().getGameType());
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}
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+ // Paper start - Extract method to allow for restarting flag
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public void u() {
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+ u(false);
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+ }
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+
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+ public void u(boolean isRestarting) {
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// CraftBukkit start - disconnect safely
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for (EntityPlayer player : this.players) {
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- player.playerConnection.disconnect(this.server.server.getShutdownMessage()); // CraftBukkit - add custom shutdown message
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+ player.playerConnection.disconnect(!isRestarting ? this.server.server.getShutdownMessage() : org.spigotmc.SpigotConfig.restartMessage); // CraftBukkit - add custom shutdown message // Paper - add isRestarting flag
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}
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// CraftBukkit end
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// Paper start - Remove collideRule team if it exists
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@@ -1392,6 +1397,7 @@ public abstract class PlayerList {
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}
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// Paper end
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}
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+ // Paper end
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// CraftBukkit start
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public void sendMessage(IChatBaseComponent[] iChatBaseComponents) {
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diff --git a/src/main/java/org/spigotmc/RestartCommand.java b/src/main/java/org/spigotmc/RestartCommand.java
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index 947c43a5..f15fd9f3 100644
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--- a/src/main/java/org/spigotmc/RestartCommand.java
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+++ b/src/main/java/org/spigotmc/RestartCommand.java
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@@ -46,88 +46,123 @@ public class RestartCommand extends Command
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org.spigotmc.AsyncCatcher.shuttingDown = true; // Paper
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try
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{
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- if ( script.isFile() )
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+ // Paper - extract method and cleanup
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+ boolean isRestarting = addShutdownHook(script);
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+ if (isRestarting) {
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+ System.out.println("Attempting to restart with " + SpigotConfig.restartScript);
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+ } else {
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+ System.out.println( "Startup script '" + SpigotConfig.restartScript + "' does not exist! Stopping server." );
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+ }
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+
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+ // Stop the watchdog
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+ WatchdogThread.doStop();
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+
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+ shutdownServer(isRestarting);
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+ } catch ( Exception ex )
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+ {
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+ ex.printStackTrace();
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+ }
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+ }
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+
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+ // Paper start - sync copied from above with minor changes, async added
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+ private static void shutdownServer(boolean isRestarting)
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+ {
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+ if (MinecraftServer.getServer().isMainThread())
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+ {
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+ // Kick all players
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+ for ( EntityPlayer p : com.google.common.collect.ImmutableList.copyOf( MinecraftServer.getServer().getPlayerList().players ) )
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+ {
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+ p.playerConnection.disconnect(SpigotConfig.restartMessage);
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+ }
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+ // Give the socket a chance to send the packets
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+ try
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+ {
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+ Thread.sleep( 100 );
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+ } catch ( InterruptedException ex )
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{
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- System.out.println( "Attempting to restart with " + SpigotConfig.restartScript );
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+ }
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- // Disable Watchdog
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- WatchdogThread.doStop();
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+ closeSocket();
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- // Kick all players
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- for ( EntityPlayer p : (List< EntityPlayer>) MinecraftServer.getServer().getPlayerList().players )
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- {
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- p.playerConnection.disconnect(SpigotConfig.restartMessage);
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- }
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- // Give the socket a chance to send the packets
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- try
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- {
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- Thread.sleep( 100 );
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- } catch ( InterruptedException ex )
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- {
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- }
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- // Close the socket so we can rebind with the new process
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- MinecraftServer.getServer().getServerConnection().b();
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+ // Actually shutdown
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+ try
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+ {
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+ MinecraftServer.getServer().stop();
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+ } catch ( Throwable t )
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+ {
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+ }
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- // Give time for it to kick in
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- try
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- {
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- Thread.sleep( 100 );
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- } catch ( InterruptedException ex )
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- {
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- }
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+ // Actually stop the JVM
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+ System.exit(0);
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- // Actually shutdown
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- try
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- {
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- MinecraftServer.getServer().stop();
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- } catch ( Throwable t )
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- {
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- }
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+ } else
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+ {
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+ // Mark the server to shutdown at the end of the tick
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+ MinecraftServer.getServer().safeShutdown(isRestarting);
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- // This will be done AFTER the server has completely halted
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- Thread shutdownHook = new Thread()
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- {
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- @Override
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- public void run()
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- {
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- try
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- {
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- String os = System.getProperty( "os.name" ).toLowerCase(java.util.Locale.ENGLISH);
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- if ( os.contains( "win" ) )
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- {
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- Runtime.getRuntime().exec( "cmd /c start " + script.getPath() );
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- } else
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- {
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- Runtime.getRuntime().exec( new String[]
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- {
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- "sh", script.getPath()
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- } );
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- }
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- } catch ( Exception e )
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- {
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- e.printStackTrace();
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- }
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- }
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- };
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- shutdownHook.setDaemon( true );
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- Runtime.getRuntime().addShutdownHook( shutdownHook );
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- } else
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+ // wait 10 seconds to see if we're actually going to try shutdown
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+ try
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+ {
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+ Thread.sleep(10000);
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+ }
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+ catch (InterruptedException ignored)
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{
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- System.out.println( "Startup script '" + SpigotConfig.restartScript + "' does not exist! Stopping server." );
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-
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- // Actually shutdown
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- try
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- {
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- MinecraftServer.getServer().stop();
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- } catch ( Throwable t )
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- {
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- }
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}
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+
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+ // Check if we've actually hit a state where the server is going to safely shutdown
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+ // if we have, let the server stop as usual
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+ if (MinecraftServer.getServer().isStopped()) return;
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+
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+ // If the server hasn't stopped by now, assume worse case and kill
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+ closeSocket();
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System.exit( 0 );
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- } catch ( Exception ex )
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+ }
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+ }
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+
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+ // Paper - Split from moved code
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+ private static void closeSocket() {
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+ // Close the socket so we can rebind with the new process
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+ MinecraftServer.getServer().getServerConnection().b();
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+
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+ // Give time for it to kick in
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+ try
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{
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- ex.printStackTrace();
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+ Thread.sleep( 100 );
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+ } catch ( InterruptedException ex )
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+ {
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+ }
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+ }
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+ // Paper end
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+
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+ // Paper - copied from above and modified to return if the hook registered
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+ private static boolean addShutdownHook(final File script) {
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+
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+ if (script.isFile()) {
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+ Thread shutdownHook = new Thread() {
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+ @Override
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+ public void run() {
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+ try {
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+ String os = System.getProperty("os.name").toLowerCase(java.util.Locale.ENGLISH);
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+ if (os.contains("win")) {
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+ Runtime.getRuntime().exec("cmd /c start " + script.getPath());
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+ } else {
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+ Runtime.getRuntime().exec(new String[]
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+ {
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+ "sh", script.getPath()
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+ });
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+ }
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+ } catch (Exception e) {
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+ e.printStackTrace();
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+ }
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+ }
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+ };
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+
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+ shutdownHook.setDaemon(true);
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+ Runtime.getRuntime().addShutdownHook(shutdownHook);
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+ return true;
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+ } else {
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+ return false;
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}
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}
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}
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--
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2.14.3
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