mirror of
https://github.com/PaperMC/Paper.git
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897dd2c840
This commit doesn't do much on its own, but adds a new Java Cleaner API that lets us hook into Garbage Collector events to reclaim pooled objects and return them to the pool. Adds framework for Network Packets to know when a packet has finished dispatching to get an idea when a packet is done sending to players. Rewrites PooledObjects impl to properly respect max pool size and remove almost all risk of contention. Bumps the Paper Async Task Queue to use 2 threads, and properly shuts it down on shutdown.
380 lines
21 KiB
Diff
380 lines
21 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sun, 12 Apr 2020 15:50:48 -0400
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Subject: [PATCH] Improved Watchdog Support
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Forced Watchdog Crash support and Improve Async Shutdown
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If the request to shut down the server is received while we are in
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a watchdog hang, immediately treat it as a crash and begin the shutdown
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process. Shutdown process is now improved to also shutdown cleanly when
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not using restart scripts either.
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If a server is deadlocked, a server owner can send SIGUP (or any other signal
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the JVM understands to shut down as it currently does) and the watchdog
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will no longer need to wait until the full timeout, allowing you to trigger
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a close process and try to shut the server down gracefully, saving player and
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world data.
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Previously there was no way to trigger this outside of waiting for a full watchdog
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timeout, which may be set to a really long time...
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Additionally, fix everything to do with shutting the server down asynchronously.
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Previously, nearly everything about the process was fragile and unsafe. Main might
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not have actually been frozen, and might still be manipulating state.
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Or, some reuest might ask main to do something in the shutdown but main is dead.
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Or worse, other things might start closing down items such as the Console or Thread Pool
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before we are fully shutdown.
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This change tries to resolve all of these issues by moving everything into the stop
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method and guaranteeing only one thread is stopping the server.
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We then issue Thread Death to the main thread of another thread initiates the stop process.
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We have to ensure Thread Death propagates correctly though to stop main completely.
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This is to ensure that if main isn't truely stuck, it's not manipulating state we are trying to save.
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This also moves all plugins who register "delayed init" tasks to occur just before "Done" so they
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are properly accounted for and wont trip watchdog on init.
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diff --git a/src/main/java/net/minecraft/server/CrashReport.java b/src/main/java/net/minecraft/server/CrashReport.java
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index 3de19c998b749ccf74958c2412a8c9506457383e..c7dc8787cc3456c5540d6a00a6ff051533edc25a 100644
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--- a/src/main/java/net/minecraft/server/CrashReport.java
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+++ b/src/main/java/net/minecraft/server/CrashReport.java
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@@ -257,6 +257,7 @@ public class CrashReport {
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}
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public static CrashReport a(Throwable throwable, String s) {
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+ if (throwable instanceof ThreadDeath) com.destroystokyo.paper.util.SneakyThrow.sneaky(throwable); // Paper
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while (throwable instanceof CompletionException && throwable.getCause() != null) {
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throwable = throwable.getCause();
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}
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diff --git a/src/main/java/net/minecraft/server/DedicatedServer.java b/src/main/java/net/minecraft/server/DedicatedServer.java
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index 1ef7890da599d13e784861035e7891efcc4cd504..b07c49f1b48cc6dedd7c2057da0ec4f6f6d446e6 100644
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--- a/src/main/java/net/minecraft/server/DedicatedServer.java
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+++ b/src/main/java/net/minecraft/server/DedicatedServer.java
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@@ -299,7 +299,7 @@ public class DedicatedServer extends MinecraftServer implements IMinecraftServer
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long l = SystemUtils.getMonotonicNanos() - i;
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String s2 = String.format(Locale.ROOT, "%.3fs", (double) l / 1.0E9D);
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- DedicatedServer.LOGGER.info("Done ({})! For help, type \"help\"", s2);
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+ //DedicatedServer.LOGGER.info("Done ({})! For help, type \"help\"", s2); // Paper moved to after init
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if (dedicatedserverproperties.announcePlayerAchievements != null) {
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((GameRules.GameRuleBoolean) this.getGameRules().get(GameRules.ANNOUNCE_ADVANCEMENTS)).a(dedicatedserverproperties.announcePlayerAchievements, (MinecraftServer) this);
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}
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@@ -750,7 +750,7 @@ public class DedicatedServer extends MinecraftServer implements IMinecraftServer
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@Override
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public void stop() {
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super.stop();
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- SystemUtils.f();
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+ //SystemUtils.f(); // Paper - moved into super
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}
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@Override
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diff --git a/src/main/java/net/minecraft/server/IAsyncTaskHandler.java b/src/main/java/net/minecraft/server/IAsyncTaskHandler.java
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index cfe43e882e524b6ab3d9702e81269c97e6b75eba..2632c7c3ec77918be7979f2aa49209e566cafc77 100644
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--- a/src/main/java/net/minecraft/server/IAsyncTaskHandler.java
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+++ b/src/main/java/net/minecraft/server/IAsyncTaskHandler.java
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@@ -135,6 +135,7 @@ public abstract class IAsyncTaskHandler<R extends Runnable> implements Mailbox<R
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try {
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r0.run();
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} catch (Exception exception) {
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+ if (exception.getCause() instanceof ThreadDeath) throw exception; // Paper
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IAsyncTaskHandler.LOGGER.fatal("Error executing task on {}", this.bi(), exception);
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}
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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 10f7283cbf6f7763186ca0dcc9eb6ba8574264a7..4e9f331975e9f1f754875db25a6c6f99ed099327 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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@@ -144,6 +144,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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private final ResourcePackRepository<ResourcePackLoader> resourcePackRepository;
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@Nullable
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private ResourcePackSourceFolder resourcePackFolder;
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+ public volatile Thread shutdownThread; // Paper
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public CommandDispatcher commandDispatcher;
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private final CraftingManager craftingManager;
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private final TagRegistry tagRegistry;
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@@ -176,7 +177,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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public boolean serverAutoSave = false; // Paper
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public File bukkitDataPackFolder;
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public CommandDispatcher vanillaCommandDispatcher;
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- private boolean forceTicks;
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+ public boolean forceTicks; // Paper
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// CraftBukkit end
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// Spigot start
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public static final int TPS = 20;
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@@ -725,7 +726,12 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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// CraftBukkit start - prevent double stopping on multiple threads
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synchronized(stopLock) {
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if (hasStopped) return;
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+ shutdownThread = Thread.currentThread();
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hasStopped = true;
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+ org.spigotmc.WatchdogThread.doStop(); // Paper
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+ if (!isMainThread()) {
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+ this.getThread().stop();
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+ }
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}
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// CraftBukkit end
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MinecraftServer.LOGGER.info("Stopping server");
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@@ -785,7 +791,18 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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this.getUserCache().c(false); // Paper
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}
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// Spigot end
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+ // Paper start - move final shutdown items here
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+ LOGGER.info("Flushing Chunk IO");
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com.destroystokyo.paper.io.PaperFileIOThread.Holder.INSTANCE.close(true, true); // Paper
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+ LOGGER.info("Closing Thread Pool");
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+ SystemUtils.shutdownServerThreadPool(); // Paper
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+ LOGGER.info("Closing Server");
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+ try {
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+ net.minecrell.terminalconsole.TerminalConsoleAppender.close(); // Paper - Use TerminalConsoleAppender
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+ } catch (Exception e) {
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+ }
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+ this.exit();
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+ // Paper end
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}
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public String getServerIp() {
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@@ -878,6 +895,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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public void run() {
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try {
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+ long serverStartTime = SystemUtils.getMonotonicNanos(); // Paper
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if (this.init()) {
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this.nextTick = SystemUtils.getMonotonicMillis();
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this.serverPing.setMOTD(new ChatComponentText(this.motd));
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@@ -885,6 +903,18 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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this.a(this.serverPing);
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// Spigot start
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+ // Paper start - move done tracking
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+ LOGGER.info("Running delayed init tasks");
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+ this.server.getScheduler().mainThreadHeartbeat(this.ticks); // run all 1 tick delay tasks during init,
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+ // this is going to be the first thing the tick process does anyways, so move done and run it after
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+ // everything is init before watchdog tick.
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+ // anything at 3+ won't be caught here but also will trip watchdog....
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+ // tasks are default scheduled at -1 + delay, and first tick will tick at 1
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+ String doneTime = String.format(java.util.Locale.ROOT, "%.3fs", (double) (SystemUtils.getMonotonicNanos() - serverStartTime) / 1.0E9D);
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+ LOGGER.info("Done ({})! For help, type \"help\"", doneTime);
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+ // Paper end
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+
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+ org.spigotmc.WatchdogThread.tick(); // Paper
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org.spigotmc.WatchdogThread.hasStarted = true; // Paper
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Arrays.fill( recentTps, 20 );
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long start = System.nanoTime(), curTime, tickSection = start; // Paper - Further improve server tick loop
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@@ -941,6 +971,12 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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this.a((CrashReport) null);
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}
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} catch (Throwable throwable) {
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+ // Paper start
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+ if (throwable instanceof ThreadDeath) {
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+ MinecraftServer.LOGGER.error("Main thread terminated by WatchDog due to hard crash", throwable);
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+ return;
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+ }
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+ // Paper end
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MinecraftServer.LOGGER.error("Encountered an unexpected exception", throwable);
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// Spigot Start
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if ( throwable.getCause() != null )
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@@ -972,14 +1008,14 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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} catch (Throwable throwable1) {
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MinecraftServer.LOGGER.error("Exception stopping the server", throwable1);
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} finally {
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- org.spigotmc.WatchdogThread.doStop(); // Spigot
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+ //org.spigotmc.WatchdogThread.doStop(); // Spigot // Paper - move into stop
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// CraftBukkit start - Restore terminal to original settings
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try {
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- net.minecrell.terminalconsole.TerminalConsoleAppender.close(); // Paper - Use TerminalConsoleAppender
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+ //net.minecrell.terminalconsole.TerminalConsoleAppender.close(); // Paper - Move into stop
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} catch (Exception ignored) {
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}
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// CraftBukkit end
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- this.exit();
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+ //this.exit(); // Paper - moved into stop
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}
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}
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@@ -1035,6 +1071,12 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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@Override
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protected TickTask postToMainThread(Runnable runnable) {
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+ // Paper start - anything that does try to post to main during watchdog crash, run on watchdog
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+ if (this.hasStopped && Thread.currentThread().equals(shutdownThread)) {
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+ runnable.run();
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+ runnable = () -> {};
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+ }
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+ // Paper end
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return new TickTask(this.ticks, runnable);
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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 e089e619a9616128c85b67497f6643262d2aeef9..aed1e9b3d0fc270e77d05dcf590683e38459da7e 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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@@ -400,7 +400,7 @@ public abstract class PlayerList {
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cserver.getPluginManager().callEvent(playerQuitEvent);
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entityplayer.getBukkitEntity().disconnect(playerQuitEvent.getQuitMessage());
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- entityplayer.playerTick();// SPIGOT-924
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+ if (server.isMainThread()) entityplayer.playerTick();// SPIGOT-924 // Paper - don't tick during emergency shutdowns (Watchdog)
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// CraftBukkit end
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// Paper start - Remove from collideRule team if needed
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diff --git a/src/main/java/net/minecraft/server/SystemUtils.java b/src/main/java/net/minecraft/server/SystemUtils.java
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index dc6d030621b66e43edf3a148f0eca43382383705..bc8b9046605657e0be5858ae9cf14d7793256983 100644
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--- a/src/main/java/net/minecraft/server/SystemUtils.java
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+++ b/src/main/java/net/minecraft/server/SystemUtils.java
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@@ -109,6 +109,7 @@ public class SystemUtils {
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return SystemUtils.c;
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}
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+ public static void shutdownServerThreadPool() { f(); } // Paper - OBFHELPER
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public static void f() {
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SystemUtils.c.shutdown();
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diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
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index de9f49b884838105c537b73d69234eb26fddb708..c8619af2cf43041e3eebec74e24c7f127a662efe 100644
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--- a/src/main/java/net/minecraft/server/World.java
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+++ b/src/main/java/net/minecraft/server/World.java
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@@ -792,6 +792,7 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
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gameprofilerfiller.exit();
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} catch (Throwable throwable) {
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+ if (throwable instanceof ThreadDeath) throw throwable; // Paper
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// Paper start - Prevent tile entity and entity crashes
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String msg = "TileEntity threw exception at " + tileentity.world.getWorld().getName() + ":" + tileentity.position.getX() + "," + tileentity.position.getY() + "," + tileentity.position.getZ();
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System.err.println(msg);
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@@ -867,6 +868,7 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
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try {
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consumer.accept(entity);
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} catch (Throwable throwable) {
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+ if (throwable instanceof ThreadDeath) throw throwable; // Paper
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// Paper start - Prevent tile entity and entity crashes
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String msg = "Entity threw exception at " + entity.world.getWorld().getName() + ":" + entity.locX() + "," + entity.locY() + "," + entity.locZ();
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System.err.println(msg);
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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index b627180729a24a83ca383f83aee53133ea1b398e..f49193d9d7cd9655fdedf64bebdcf4e1a9b77f2c 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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@@ -1706,7 +1706,7 @@ public final class CraftServer implements Server {
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@Override
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public boolean isPrimaryThread() {
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- return Thread.currentThread().equals(console.serverThread); // Paper - Fix issues with detecting main thread properly
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+ return Thread.currentThread().equals(console.serverThread) || Thread.currentThread().equals(net.minecraft.server.MinecraftServer.getServer().shutdownThread); // Paper - Fix issues with detecting main thread properly, the only time Watchdog will be used is during a crash shutdown which is a "try our best" scenario
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}
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@Override
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diff --git a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java b/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java
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index 449e99d1b673870ed6892f6ab2c715a2db35c35d..899a525209cfe047ce57e758c6328a130f916dc6 100644
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--- a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java
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+++ b/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java
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@@ -12,12 +12,25 @@ public class ServerShutdownThread extends Thread {
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@Override
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public void run() {
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try {
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+ // Paper start - try to shutdown on main
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+ server.safeShutdown(false, false);
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+ for (int i = 1000; i > 0 && !server.hasStopped(); i -= 100) {
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+ Thread.sleep(100);
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+ }
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+ if (server.hasStopped()) {
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+ return;
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+ }
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+ // Looks stalled, close async
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org.spigotmc.AsyncCatcher.enabled = false; // Spigot
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org.spigotmc.AsyncCatcher.shuttingDown = true; // Paper
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+ server.forceTicks = true;
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server.close();
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+ } catch (InterruptedException e) {
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+ e.printStackTrace();
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+ // Paper end
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} finally {
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try {
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- net.minecrell.terminalconsole.TerminalConsoleAppender.close(); // Paper - Use TerminalConsoleAppender
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+ //net.minecrell.terminalconsole.TerminalConsoleAppender.close(); // Paper - Move into stop
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} catch (Exception e) {
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}
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}
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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 aefea3a9a8b9b75c62bd20018be7cd166a213001..123de5ac9026508e21cdc225f0962f5c3c46fed5 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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@@ -139,7 +139,7 @@ public class RestartCommand extends Command
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// Paper end
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// Paper start - copied from above and modified to return if the hook registered
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- private static boolean addShutdownHook(String restartScript)
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+ public static boolean addShutdownHook(String restartScript)
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{
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String[] split = restartScript.split( " " );
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if ( split.length > 0 && new File( split[0] ).isFile() )
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diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java
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index 5bdcdcf9e85b73086722783bff26321d03382bb9..fe4b8caf28b2d36b2034ac90b1a76dea7b691feb 100644
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--- a/src/main/java/org/spigotmc/WatchdogThread.java
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+++ b/src/main/java/org/spigotmc/WatchdogThread.java
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@@ -41,6 +41,7 @@ public class WatchdogThread extends Thread
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{
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if ( instance == null )
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{
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+ if (timeoutTime <= 0) timeoutTime = 300; // Paper
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instance = new WatchdogThread( timeoutTime * 1000L, restart );
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instance.start();
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}
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@@ -67,12 +68,13 @@ public class WatchdogThread extends Thread
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// Paper start
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Logger log = Bukkit.getServer().getLogger();
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long currentTime = monotonicMillis();
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- if ( lastTick != 0 && currentTime > lastTick + earlyWarningEvery && !Boolean.getBoolean("disable.watchdog") )
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+ MinecraftServer server = MinecraftServer.getServer();
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+ if (lastTick != 0 && hasStarted && (!server.isRunning() || (currentTime > lastTick + earlyWarningEvery && !Boolean.getBoolean("disable.watchdog")) ))
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{
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- boolean isLongTimeout = currentTime > lastTick + timeoutTime;
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+ boolean isLongTimeout = currentTime > lastTick + timeoutTime || (!server.isRunning() && !server.hasStopped() && currentTime > lastTick + 1000);
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// Don't spam early warning dumps
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if ( !isLongTimeout && (earlyWarningEvery <= 0 || !hasStarted || currentTime < lastEarlyWarning + earlyWarningEvery || currentTime < lastTick + earlyWarningDelay)) continue;
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- if ( !isLongTimeout && MinecraftServer.getServer().hasStopped()) continue; // Don't spam early watchdog warnings during shutdown, we'll come back to this...
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+ if ( !isLongTimeout && server.hasStopped()) continue; // Don't spam early watchdog warnings during shutdown, we'll come back to this...
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lastEarlyWarning = currentTime;
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if (isLongTimeout) {
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// Paper end
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@@ -114,7 +116,7 @@ public class WatchdogThread extends Thread
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log.log( Level.SEVERE, "------------------------------" );
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log.log( Level.SEVERE, "Server thread dump (Look for plugins here before reporting to Paper!):" ); // Paper
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ChunkTaskManager.dumpAllChunkLoadInfo(); // Paper
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- dumpThread( ManagementFactory.getThreadMXBean().getThreadInfo( MinecraftServer.getServer().serverThread.getId(), Integer.MAX_VALUE ), log );
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+ dumpThread( ManagementFactory.getThreadMXBean().getThreadInfo( server.serverThread.getId(), Integer.MAX_VALUE ), log );
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log.log( Level.SEVERE, "------------------------------" );
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//
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// Paper start - Only print full dump on long timeouts
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@@ -135,9 +137,24 @@ public class WatchdogThread extends Thread
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if ( isLongTimeout )
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{
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- if ( restart && !MinecraftServer.getServer().hasStopped() )
|
|
+ if ( !server.hasStopped() )
|
|
{
|
|
- RestartCommand.restart();
|
|
+ AsyncCatcher.enabled = false; // Disable async catcher incase it interferes with us
|
|
+ AsyncCatcher.shuttingDown = true;
|
|
+ server.forceTicks = true;
|
|
+ if (restart) {
|
|
+ RestartCommand.addShutdownHook( SpigotConfig.restartScript );
|
|
+ }
|
|
+ // try one last chance to safe shutdown on main incase it 'comes back'
|
|
+ server.safeShutdown(false, restart);
|
|
+ try {
|
|
+ Thread.sleep(1000);
|
|
+ } catch (InterruptedException e) {
|
|
+ e.printStackTrace();
|
|
+ }
|
|
+ if (!server.hasStopped()) {
|
|
+ server.close();
|
|
+ }
|
|
}
|
|
break;
|
|
} // Paper end
|