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Rewrite chunk system (#8177)

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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.
This commit is contained in:
Spottedleaf 2022-09-26 01:02:51 -07:00 • committed by GitHub
parent abe53a7eb4
commit 01a13871de
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942 changed files with 20131 additions and 2697 deletions
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86
patches/server/0102-Async-GameProfileCache-saving.patch
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@ -1,86 +0,0 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 16 May 2016 20:47:41 -0400
Subject: [PATCH] Async GameProfileCache saving
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 1dc2234b8218699d82a56e23d9390bee6cc7937b..da790861a3689195446040e8e7d2f898eee3068e 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -945,7 +945,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
} catch (java.lang.InterruptedException ignored) {} // Paper
if (org.spigotmc.SpigotConfig.saveUserCacheOnStopOnly) {
MinecraftServer.LOGGER.info("Saving usercache.json");
- this.getProfileCache().save();
+ this.getProfileCache().save(false); // Paper
}
// Spigot end
com.destroystokyo.paper.io.PaperFileIOThread.Holder.INSTANCE.close(true, true); // Paper
diff --git a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
index d70d97c65d5bdb47a17a226d65bad8ba1421b11b..5b2980866ae3cd78f1852b0ad396ff1967ddfc16 100644
--- a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
+++ b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
@@ -247,7 +247,7 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
}
if (this.convertOldUsers()) {
- this.getProfileCache().save();
+ this.getProfileCache().save(false); // Paper
}
if (!OldUsersConverter.serverReadyAfterUserconversion(this)) {
diff --git a/src/main/java/net/minecraft/server/players/GameProfileCache.java b/src/main/java/net/minecraft/server/players/GameProfileCache.java
index d246563021c32127e570809f4d849b6a156f4dc6..2249beff3200c5dab1e81bd3d10f2c3bf1e7dbc9 100644
--- a/src/main/java/net/minecraft/server/players/GameProfileCache.java
+++ b/src/main/java/net/minecraft/server/players/GameProfileCache.java
@@ -127,7 +127,7 @@ public class GameProfileCache {
GameProfileCache.GameProfileInfo usercache_usercacheentry = new GameProfileCache.GameProfileInfo(profile, date);
this.safeAdd(usercache_usercacheentry);
- if( !org.spigotmc.SpigotConfig.saveUserCacheOnStopOnly ) this.save(); // Spigot - skip saving if disabled
+ if( !org.spigotmc.SpigotConfig.saveUserCacheOnStopOnly ) this.save(true); // Spigot - skip saving if disabled // Paper - async
}
private long getNextOperation() {
@@ -160,7 +160,7 @@ public class GameProfileCache {
}
if (flag && !org.spigotmc.SpigotConfig.saveUserCacheOnStopOnly) { // Spigot - skip saving if disabled
- this.save();
+ this.save(true); // Paper
}
return optional;
@@ -274,7 +274,7 @@ public class GameProfileCache {
return arraylist;
}
- public void save() {
+ public void save(boolean asyncSave) { // Paper
JsonArray jsonarray = new JsonArray();
DateFormat dateformat = GameProfileCache.createDateFormat();
@@ -282,6 +282,7 @@ public class GameProfileCache {
jsonarray.add(GameProfileCache.writeGameProfile(usercache_usercacheentry, dateformat));
});
String s = this.gson.toJson(jsonarray);
+ Runnable save = () -> { // Paper
try {
BufferedWriter bufferedwriter = Files.newWriter(this.file, StandardCharsets.UTF_8);
@@ -306,6 +307,14 @@ public class GameProfileCache {
} catch (IOException ioexception) {
;
}
+ // Paper start
+ };
+ if (asyncSave) {
+ net.minecraft.server.MCUtil.scheduleAsyncTask(save);
+ } else {
+ save.run();
+ }
+ // Paper end
}