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Paper/patches/server/0397-Wait-for-Async-Tasks-during-shutdown.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 10 May 2020 22:16:17 -0400
Subject: [PATCH] Wait for Async Tasks during shutdown
Server.reload() had this logic to give time for tasks to shutdown,
however shutdown did not...
Adds a 5 second grace period for any async tasks to finish and warns
if any are still running after that delay just as reload does.
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 e230a6e3810929c2f9ac70a98c9fc41734ec06c2..81d4870060ea418fecfdd01f1357899038c95fe9 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -958,6 +958,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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// CraftBukkit start
if (this.server != null) {
this.server.disablePlugins();
+ this.server.waitForAsyncTasksShutdown(); // Paper
}
// CraftBukkit end
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this.getConnection().stop();
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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 913c1e4ee2df8160e1cd15a352fc71d61e7e38dc..e12b1d7c30d4365130f5761614b095971e047241 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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@@ -1015,6 +1015,31 @@ public final class CraftServer implements Server {
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org.spigotmc.WatchdogThread.hasStarted = true; // Paper - Disable watchdog early timeout on reload
}
+ // Paper start
+ public void waitForAsyncTasksShutdown() {
+ int pollCount = 0;
+
+ // Wait for at most 5 seconds for plugins to close their threads
+ while (pollCount < 10*5 && getScheduler().getActiveWorkers().size() > 0) {
+ try {
+ Thread.sleep(100);
+ } catch (InterruptedException e) {}
+ pollCount++;
+ }
+
+ List<BukkitWorker> overdueWorkers = getScheduler().getActiveWorkers();
+ for (BukkitWorker worker : overdueWorkers) {
+ Plugin plugin = worker.getOwner();
+ getLogger().log(Level.SEVERE, String.format(
+ "Nag author(s): '%s' of '%s' about the following: %s",
+ plugin.getPluginMeta().getAuthors(),
+ plugin.getPluginMeta().getDisplayName(),
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+ "This plugin is not properly shutting down its async tasks when it is being shut down. This task may throw errors during the final shutdown logs and might not complete before process dies."
+ ));
+ }
+ }
+ // Paper end
+
@Override
public void reloadData() {
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ReloadCommand.reload(this.console);