mirror of
https://github.com/PaperMC/Paper.git
synced 2024-11-03 17:29:56 +01:00
fb25dc17c6
Upstream has released updates that appears to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing Bukkit Changes: da08d022 SPIGOT-4700: Add PlayerFishEvent.State.REEL_IN 0cef14e4 Remove draft API from selectEntities CraftBukkit Changes:a46fdbc6Remove outdated build delay.3697519bSPIGOT-4708: Fix ExactChoice recipes neglecting material9ead7009SPIGOT-4677: Add minecraft.admin.command_feedback permissionc3749a23Remove the Damage tag from items when it is 0.f74c7b95SPIGOT-4706: Can't interact with active item494eef45Mention requirement of JIRA ticket for bug fixes51d62decSPIGOT-4702: Exception when middle clicking certain slotsbe557e69SPIGOT-4700: Add PlayerFishEvent.State.REEL_IN
68 lines
3.0 KiB
Diff
68 lines
3.0 KiB
Diff
From ea164536bfa0dfb4d6857ee576817bbc270be45f Mon Sep 17 00:00:00 2001
|
|
From: Aikar <aikar@aikar.co>
|
|
Date: Mon, 23 Jul 2018 23:40:04 -0400
|
|
Subject: [PATCH] Optimize Region File Cache
|
|
|
|
CraftBukkit added synchronization to read and write methods. This adds
|
|
much more contention on this object for accessing region files, as
|
|
the entire read and write of NBT data is now a blocking operation.
|
|
|
|
This causes issues when something then simply needs to check if a chunk exists
|
|
on the main thread, causing a block...
|
|
|
|
However, this synchronization was unnecessary, because there is already
|
|
enough synchronization done to keep things safe
|
|
|
|
1) Obtaining a Region File: Those methods are still static synchronized.
|
|
Meaning we can safely obtain a Region File concurrently.
|
|
|
|
2) RegionFile data access: Methods reading and manipulating data from
|
|
a region file are also marked synchronized, ensuring that no 2 processes
|
|
are reading or writing data at the same time.
|
|
|
|
3) Checking a region file for chunkExists: getOffset is also synchronized
|
|
ensuring that even if a chunk is currently being written, it will be safe.
|
|
|
|
By removing these synchronizations, we reduce the locking to only
|
|
when data is being write or read.
|
|
|
|
GZIP compression and NBT Buffer creation will no longer be part of the
|
|
synchronized context, reducing lock times.
|
|
|
|
Ultimately: This brings us back to Vanilla, which has had no indication of region file loss.
|
|
|
|
diff --git a/src/main/java/net/minecraft/server/RegionFileCache.java b/src/main/java/net/minecraft/server/RegionFileCache.java
|
|
index 964996976a..d072222390 100644
|
|
--- a/src/main/java/net/minecraft/server/RegionFileCache.java
|
|
+++ b/src/main/java/net/minecraft/server/RegionFileCache.java
|
|
@@ -99,7 +99,7 @@ public class RegionFileCache {
|
|
|
|
@Nullable
|
|
// CraftBukkit start - call sites hoisted for synchronization
|
|
- public static synchronized NBTTagCompound read(File file, int i, int j) throws IOException {
|
|
+ public static NBTTagCompound read(File file, int i, int j) throws IOException { // Paper - remove synchronization
|
|
RegionFile regionfile = a(file, i, j);
|
|
|
|
DataInputStream datainputstream = regionfile.a(i & 31, j & 31);
|
|
@@ -112,7 +112,7 @@ public class RegionFileCache {
|
|
}
|
|
|
|
@Nullable
|
|
- public static synchronized void write(File file, int i, int j, NBTTagCompound nbttagcompound) throws IOException {
|
|
+ public static void write(File file, int i, int j, NBTTagCompound nbttagcompound) throws IOException {
|
|
int attempts = 0; Exception laste = null; while (attempts++ < 5) { try { // Paper
|
|
RegionFile regionfile = a(file, i, j);
|
|
|
|
@@ -138,7 +138,7 @@ public class RegionFileCache {
|
|
// Paper end
|
|
}
|
|
|
|
- public static synchronized boolean chunkExists(File file, int i, int j) {
|
|
+ public static boolean chunkExists(File file, int i, int j) { // Paper - remove synchronization
|
|
RegionFile regionfile = b(file, i, j);
|
|
|
|
return regionfile != null ? regionfile.d(i & 31, j & 31) : false;
|
|
--
|
|
2.21.0
|
|
|