From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Spottedleaf 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 5bdd1958dff2fc9321bf858e6aa4cc5ad0a5a9ca..354e8096d404bfca8055aafcd80b2de29a7bc929 100644 --- a/src/main/java/net/minecraft/Util.java +++ b/src/main/java/net/minecraft/Util.java @@ -76,6 +76,22 @@ public class Util { private static final AtomicInteger WORKER_COUNT = new AtomicInteger(1); private static final ExecutorService BOOTSTRAP_EXECUTOR = makeExecutor("Bootstrap", -2); // Paper - add -2 priority private static final ExecutorService BACKGROUND_EXECUTOR = makeExecutor("Main", -1); // Paper - add -1 priority + // 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.fatal("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(); public static LongSupplier timeSource = System::nanoTime; public static final UUID NIL_UUID = new UUID(0L, 0L); diff --git a/src/main/java/net/minecraft/server/players/GameProfileCache.java b/src/main/java/net/minecraft/server/players/GameProfileCache.java index a157f71cf55b9e97fac56c7c55b552da86000fd5..4e2833dc941863cc54416c81f09c688b5616d7a4 100644 --- a/src/main/java/net/minecraft/server/players/GameProfileCache.java +++ b/src/main/java/net/minecraft/server/players/GameProfileCache.java @@ -200,7 +200,7 @@ 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 e3efea8623c7d34915069a6b9b7da9f2b1694c28..118472b83a21a250f398c088c91ac4560c19c749 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 @@ -148,7 +148,7 @@ public class SkullBlockEntity extends BlockEntity { public static void updateGameprofile(@Nullable GameProfile owner, Consumer 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) {