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01a13871de
Patch documentation to come Issues with the old system that are fixed now: - World generation does not scale with cpu cores effectively. - Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps. - Unreliable prioritisation of chunk gen/load calls that block the main thread. - Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved. - Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal. - Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles. The above list is not complete. The patch documentation will complete it. New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil. Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft. The old legacy chunk system patches have been moved to the removed folder in case we need them again.
129 lines
6.2 KiB
Diff
129 lines
6.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Sat, 11 Jul 2020 05:09:28 -0700
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Subject: [PATCH] Fix GameProfileCache concurrency
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Separate lookup and state access locks prevent lookups
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from stalling simple state access/write calls
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diff --git a/src/main/java/net/minecraft/server/players/GameProfileCache.java b/src/main/java/net/minecraft/server/players/GameProfileCache.java
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index 5e3bc0590e59770490b1c6c818d99be054214a8a..84bdf4a849b09a90da6c22f4080386e85a53f6b3 100644
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--- a/src/main/java/net/minecraft/server/players/GameProfileCache.java
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+++ b/src/main/java/net/minecraft/server/players/GameProfileCache.java
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@@ -62,6 +62,11 @@ public class GameProfileCache {
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@Nullable
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private Executor executor;
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+ // Paper start
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+ protected final java.util.concurrent.locks.ReentrantLock stateLock = new java.util.concurrent.locks.ReentrantLock();
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+ protected final java.util.concurrent.locks.ReentrantLock lookupLock = new java.util.concurrent.locks.ReentrantLock();
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+ // Paper end
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+
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public GameProfileCache(GameProfileRepository profileRepository, File cacheFile) {
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this.profileRepository = profileRepository;
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this.file = cacheFile;
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@@ -69,6 +74,7 @@ public class GameProfileCache {
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}
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private void safeAdd(GameProfileCache.GameProfileInfo entry) {
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+ try { this.stateLock.lock(); // Paper - allow better concurrency
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GameProfile gameprofile = entry.getProfile();
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entry.setLastAccess(this.getNextOperation());
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@@ -83,6 +89,7 @@ public class GameProfileCache {
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if (uuid != null) {
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this.profilesByUUID.put(uuid, entry);
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}
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+ } finally { this.stateLock.unlock(); } // Paper - allow better concurrency
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}
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@@ -138,17 +145,20 @@ public class GameProfileCache {
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// Paper start
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public @Nullable GameProfile getProfileIfCached(String name) {
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+ try { this.stateLock.lock(); // Paper - allow better concurrency
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GameProfileCache.GameProfileInfo entry = this.profilesByName.get(name.toLowerCase(Locale.ROOT));
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if (entry == null) {
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return null;
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}
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entry.setLastAccess(this.getNextOperation());
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return entry.getProfile();
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+ } finally { this.stateLock.unlock(); } // Paper - allow better concurrency
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}
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// Paper end
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public Optional<GameProfile> get(String name) {
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String s1 = name.toLowerCase(Locale.ROOT);
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+ boolean stateLocked = true; try { this.stateLock.lock(); // Paper - allow better concurrency
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GameProfileCache.GameProfileInfo usercache_usercacheentry = (GameProfileCache.GameProfileInfo) this.profilesByName.get(s1);
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boolean flag = false;
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@@ -164,8 +174,12 @@ public class GameProfileCache {
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if (usercache_usercacheentry != null) {
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usercache_usercacheentry.setLastAccess(this.getNextOperation());
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optional = Optional.of(usercache_usercacheentry.getProfile());
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+ stateLocked = false; this.stateLock.unlock(); // Paper - allow better concurrency
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} else {
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+ stateLocked = false; this.stateLock.unlock(); // Paper - allow better concurrency
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+ try { this.lookupLock.lock(); // Paper - allow better concurrency
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optional = GameProfileCache.lookupGameProfile(this.profileRepository, name); // Spigot - use correct case for offline players
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+ } finally { this.lookupLock.unlock(); } // Paper - allow better concurrency
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if (optional.isPresent()) {
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this.add((GameProfile) optional.get());
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flag = false;
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@@ -177,6 +191,7 @@ public class GameProfileCache {
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}
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return optional;
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+ } finally { if (stateLocked) { this.stateLock.unlock(); } } // Paper - allow better concurrency
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}
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public void getAsync(String username, Consumer<Optional<GameProfile>> consumer) {
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@@ -203,6 +218,7 @@ public class GameProfileCache {
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}
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public Optional<GameProfile> get(UUID uuid) {
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+ try { this.stateLock.lock(); // Paper - allow better concurrency
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GameProfileCache.GameProfileInfo usercache_usercacheentry = (GameProfileCache.GameProfileInfo) this.profilesByUUID.get(uuid);
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if (usercache_usercacheentry == null) {
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@@ -211,6 +227,7 @@ public class GameProfileCache {
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usercache_usercacheentry.setLastAccess(this.getNextOperation());
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return Optional.of(usercache_usercacheentry.getProfile());
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}
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+ } finally { this.stateLock.unlock(); } // Paper - allow better concurrency
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}
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public void setExecutor(Executor executor) {
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@@ -291,7 +308,7 @@ public class GameProfileCache {
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JsonArray jsonarray = new JsonArray();
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DateFormat dateformat = GameProfileCache.createDateFormat();
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- this.getTopMRUProfiles(org.spigotmc.SpigotConfig.userCacheCap).forEach((usercache_usercacheentry) -> { // Spigot
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+ this.listTopMRUProfiles(org.spigotmc.SpigotConfig.userCacheCap).forEach((usercache_usercacheentry) -> { // Spigot // Paper - allow better concurrency
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jsonarray.add(GameProfileCache.writeGameProfile(usercache_usercacheentry, dateformat));
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});
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String s = this.gson.toJson(jsonarray);
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@@ -332,8 +349,19 @@ public class GameProfileCache {
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}
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private Stream<GameProfileCache.GameProfileInfo> getTopMRUProfiles(int limit) {
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- return ImmutableList.copyOf(this.profilesByUUID.values()).stream().sorted(Comparator.comparing(GameProfileCache.GameProfileInfo::getLastAccess).reversed()).limit((long) limit);
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+ // Paper start - allow better concurrency
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+ return this.listTopMRUProfiles(limit).stream();
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+ }
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+
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+ private List<GameProfileCache.GameProfileInfo> listTopMRUProfiles(int limit) {
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+ try {
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+ this.stateLock.lock();
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+ return this.profilesByUUID.values().stream().sorted(Comparator.comparing(GameProfileCache.GameProfileInfo::getLastAccess).reversed()).limit(limit).toList();
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+ } finally {
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+ this.stateLock.unlock();
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+ }
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}
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+ // Paper end
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private static JsonElement writeGameProfile(GameProfileCache.GameProfileInfo entry, DateFormat dateFormat) {
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JsonObject jsonobject = new JsonObject();
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