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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sun, 8 Aug 2021 16:26:46 -0700
Subject: [PATCH] Do not submit profile lookups to worldgen threads
They block. On network I/O.
If enough tasks are submitted the server will eventually stall
out due to a sync load, as the worldgen threads will be
stalling on profile lookups.
diff --git a/src/main/java/net/minecraft/Util.java b/src/main/java/net/minecraft/Util.java
index 168ab805ecc48dd55db90eb7fe1c56fda3f2776c..336a26733b5bf73455f8ec10347c1e08b8e866f7 100644
--- a/src/main/java/net/minecraft/Util.java
+++ b/src/main/java/net/minecraft/Util.java
@@ -81,6 +81,22 @@ public class Util {
private static final AtomicInteger WORKER_COUNT = new AtomicInteger(1);
private static final ExecutorService BOOTSTRAP_EXECUTOR = makeExecutor("Bootstrap");
private static final ExecutorService BACKGROUND_EXECUTOR = makeExecutor("Main");
+ // Paper start - don't submit BLOCKING PROFILE LOOKUPS to the world gen thread
+ public static final ExecutorService PROFILE_EXECUTOR = Executors.newFixedThreadPool(2, new java.util.concurrent.ThreadFactory() {
+
+ private final AtomicInteger count = new AtomicInteger();
+
+ @Override
+ public Thread newThread(Runnable run) {
+ Thread ret = new Thread(run);
+ ret.setName("Profile Lookup Executor #" + this.count.getAndIncrement());
+ ret.setUncaughtExceptionHandler((Thread thread, Throwable throwable) -> {
+ LOGGER.error("Uncaught exception in thread " + thread.getName(), throwable);
+ });
+ return ret;
+ }
+ });
+ // Paper end - don't submit BLOCKING PROFILE LOOKUPS to the world gen thread
private static final ExecutorService IO_POOL = makeIoExecutor();
private static final DateTimeFormatter FILENAME_DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss", Locale.ROOT);
public static TimeSource.NanoTimeSource timeSource = System::nanoTime;
diff --git a/src/main/java/net/minecraft/server/players/GameProfileCache.java b/src/main/java/net/minecraft/server/players/GameProfileCache.java
index 376845f5a25a348e76193fac5c047b0ba2fb080f..2a0cf0a8a79c09566c598197fc6f8c447d4bbd72 100644
--- a/src/main/java/net/minecraft/server/players/GameProfileCache.java
+++ b/src/main/java/net/minecraft/server/players/GameProfileCache.java
@@ -181,7 +181,7 @@ public class GameProfileCache {
} else {
this.requests.put(username, CompletableFuture.supplyAsync(() -> {
return this.get(username);
- }, Util.backgroundExecutor()).whenCompleteAsync((optional, throwable) -> {
+ }, Util.PROFILE_EXECUTOR).whenCompleteAsync((optional, throwable) -> { // Paper - not a good idea to use BLOCKING OPERATIONS on the worldgen executor
this.requests.remove(username);
}, this.executor).whenCompleteAsync((optional, throwable) -> {
consumer.accept(optional);
diff --git a/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java
index 0c7e29b589ab106013d979a20edc415b4b32a677..c5d5d90d10b30f30d1262367b3d75df43fbdb231 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java
@@ -120,7 +120,7 @@ public class SkullBlockEntity extends BlockEntity {
public static void updateGameprofile(@Nullable GameProfile owner, Consumer<GameProfile> callback) {
if (owner != null && !StringUtil.isNullOrEmpty(owner.getName()) && (!owner.isComplete() || !owner.getProperties().containsKey("textures")) && profileCache != null && sessionService != null) {
profileCache.getAsync(owner.getName(), (profile) -> {
- Util.backgroundExecutor().execute(() -> {
+ Util.PROFILE_EXECUTOR.execute(() -> { // Paper - not a good idea to use BLOCKING OPERATIONS on the worldgen executor
Util.ifElse(profile, (profilex) -> {
Property property = Iterables.getFirst(profilex.getProperties().get("textures"), (Property)null);
if (property == null) {
diff --git a/src/main/java/org/bukkit/craftbukkit/profile/CraftPlayerProfile.java b/src/main/java/org/bukkit/craftbukkit/profile/CraftPlayerProfile.java
index 2d49bd6f3f017d43dfaa23cedf35040b64bcdcf8..9edc5e73819e0b55372f77c5e292eece74d837c7 100644
--- a/src/main/java/org/bukkit/craftbukkit/profile/CraftPlayerProfile.java
+++ b/src/main/java/org/bukkit/craftbukkit/profile/CraftPlayerProfile.java
@@ -121,7 +121,7 @@ public final class CraftPlayerProfile implements PlayerProfile {
@Override
public CompletableFuture<PlayerProfile> update() {
- return CompletableFuture.supplyAsync(this::getUpdatedProfile, Util.backgroundExecutor());
+ return CompletableFuture.supplyAsync(this::getUpdatedProfile, Util.PROFILE_EXECUTOR); // Paper - not a good idea to use BLOCKING OPERATIONS on the worldgen executor
}
private CraftPlayerProfile getUpdatedProfile() {
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