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 9d91e7890d8cba72f0aa2ca9661f6de7ae8a0dcd..cf54e2c8e8aadb9e7343382a5ba59c657234c9b9 100644 --- a/src/main/java/net/minecraft/Util.java +++ b/src/main/java/net/minecraft/Util.java @@ -93,6 +93,22 @@ public class Util { private static final ExecutorService BACKGROUND_EXECUTOR = makeExecutor("Main"); private static final ExecutorService IO_POOL = makeIoExecutor("IO-Worker-", false); private static final ExecutorService DOWNLOAD_POOL = makeIoExecutor("Download-", true); + // 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 DateTimeFormatter FILENAME_DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss", Locale.ROOT); public static final int LINEAR_LOOKUP_THRESHOLD = 8; public static final long NANOS_PER_MILLI = 1000000L; diff --git a/src/main/java/net/minecraft/server/players/GameProfileCache.java b/src/main/java/net/minecraft/server/players/GameProfileCache.java index aeb0c7ce9b6f93dadd407dbdefba053568f2e2fe..416b26c2ab62b29d640169166980e398d5824b14 100644 --- a/src/main/java/net/minecraft/server/players/GameProfileCache.java +++ b/src/main/java/net/minecraft/server/players/GameProfileCache.java @@ -169,7 +169,7 @@ public class GameProfileCache { } else { CompletableFuture> completablefuture1 = CompletableFuture.supplyAsync(() -> { return this.get(username); - }, Util.backgroundExecutor()).whenCompleteAsync((optional, throwable) -> { + }, Util.PROFILE_EXECUTOR).whenCompleteAsync((optional, throwable) -> { // Paper - don't submit BLOCKING PROFILE LOOKUPS to the world gen thread this.requests.remove(username); }, this.executor); 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 6097e0ab387cfa4c2c9ab0389fc5bb6cd899ecc3..ebba6bc5b337d19e32be5a78294501ed8300f2bd 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 @@ -105,7 +105,7 @@ public class SkullBlockEntity extends BlockEntity { ProfileResult profileResult = apiServices.sessionService().fetchProfile(uuid, true); return Optional.ofNullable(profileResult).map(ProfileResult::profile); } - }, Util.backgroundExecutor()); + }, Util.PROFILE_EXECUTOR); // Paper - don't submit BLOCKING PROFILE LOOKUPS to the world gen thread } public static void clear() { diff --git a/src/main/java/org/bukkit/craftbukkit/profile/CraftPlayerProfile.java b/src/main/java/org/bukkit/craftbukkit/profile/CraftPlayerProfile.java index 44174c5a7b255af489c1e4bf589299e6bdbb90a3..ab18b1d480f7ecc0ad9a51471d8f45b0da74d8cf 100644 --- a/src/main/java/org/bukkit/craftbukkit/profile/CraftPlayerProfile.java +++ b/src/main/java/org/bukkit/craftbukkit/profile/CraftPlayerProfile.java @@ -136,7 +136,7 @@ public final class CraftPlayerProfile implements PlayerProfile { @Override public CompletableFuture update() { - return CompletableFuture.supplyAsync(this::getUpdatedProfile, Util.backgroundExecutor()); + return CompletableFuture.supplyAsync(this::getUpdatedProfile, Util.PROFILE_EXECUTOR); // Paper - don't submit BLOCKING PROFILE LOOKUPS to the world gen thread } private CraftPlayerProfile getUpdatedProfile() {