Paper/Spigot-Server-Patches/0500-Delay-Chunk-Unloads-based-on-Player-Movement.patch
Daniel Ennis c97ce029e9
1.16.2 Release (#4123)
PaperMC believes that 1.16.2 is now ready for general release as we fixed the main issue plagueing the 1.16.x release, the MapLike data conversion issues.

Until now, it was not safe for a server to convert a world to 1.16.2 without data conversion issues around villages and potentially other things. If you did, those MapLike errors meant something went wrong.

This is now resolved.

Big thanks to all those that helped, notably @BillyGalbreath and @Proximyst who did large parts of the update process with me.

Please as always, backup your worlds and test before updating to 1.16.2!

If you update to 1.16.2, there is no going back to an older build than this.

---------------------------------

Co-authored-by: William Blake Galbreath <Blake.Galbreath@GMail.com>
Co-authored-by: Mariell Hoversholm <proximyst@proximyst.com>
Co-authored-by: krolik-exe <69214078+krolik-exe@users.noreply.github.com>
Co-authored-by: BillyGalbreath <BillyGalbreath@users.noreply.github.com>
Co-authored-by: stonar96 <minecraft.stonar96@gmail.com>
Co-authored-by: Shane Freeder <theboyetronic@gmail.com>
Co-authored-by: Jason <jasonpenilla2@me.com>
Co-authored-by: kashike <kashike@vq.lc>
Co-authored-by: Aurora <21148213+aurorasmiles@users.noreply.github.com>
Co-authored-by: KennyTV <kennytv@t-online.de>
Co-authored-by: commandblockguy <commandblockguy1@gmail.com>
Co-authored-by: DigitalRegent <misterwener@gmail.com>
Co-authored-by: ishland <ishlandmc@yeah.net>
2020-08-24 22:40:19 -04:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 18 Jun 2016 23:22:12 -0400
Subject: [PATCH] Delay Chunk Unloads based on Player Movement
When players are moving in the world, doing things such as building or exploring,
they will commonly go back and forth in a small area. This causes a ton of chunk load
and unload activity on the edge chunks of their view distance.
A simple back and forth movement in 6 blocks could spam a chunk to thrash a
loading and unload cycle over and over again.
This is very wasteful. This system introduces a delay of inactivity on a chunk
before it actually unloads, which will be handled by the ticket expiry process.
This allows servers with smaller worlds who do less long distance exploring to stop
wasting cpu cycles on saving/unloading/reloading chunks repeatedly.
diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 6a62f2000a58312773a8cb57c546d65df980b844..e1f943507de05f9f9559b8625342a02d9b8a51d6 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -623,4 +623,13 @@ public class PaperWorldConfig {
private void viewDistance() {
this.noTickViewDistance = this.getInt("viewdistances.no-tick-view-distance", -1);
}
+
+ public long delayChunkUnloadsBy;
+ private void delayChunkUnloadsBy() {
+ delayChunkUnloadsBy = PaperConfig.getSeconds(getString("delay-chunk-unloads-by", "10s"));
+ if (delayChunkUnloadsBy > 0) {
+ log("Delaying chunk unloads by " + delayChunkUnloadsBy + " seconds");
+ delayChunkUnloadsBy *= 20;
+ }
+ }
}
diff --git a/src/main/java/net/minecraft/server/ChunkMapDistance.java b/src/main/java/net/minecraft/server/ChunkMapDistance.java
index 09fec533d7feebb90e989007dd19c952823550ba..3c7b225edbe23dc1959002293a6f8b816287b5a8 100644
--- a/src/main/java/net/minecraft/server/ChunkMapDistance.java
+++ b/src/main/java/net/minecraft/server/ChunkMapDistance.java
@@ -176,6 +176,27 @@ public abstract class ChunkMapDistance {
boolean removed = false; // CraftBukkit
if (arraysetsorted.remove(ticket)) {
removed = true; // CraftBukkit
+ // Paper start - delay chunk unloads for player tickets
+ long delayChunkUnloadsBy = chunkMap.world.paperConfig.delayChunkUnloadsBy;
+ if (ticket.getTicketType() == TicketType.PLAYER && delayChunkUnloadsBy > 0) {
+ boolean hasPlayer = false;
+ for (Ticket<?> ticket1 : arraysetsorted) {
+ if (ticket1.getTicketType() == TicketType.PLAYER) {
+ hasPlayer = true;
+ break;
+ }
+ }
+ PlayerChunk playerChunk = chunkMap.getUpdatingChunk(i);
+ if (!hasPlayer && playerChunk != null && playerChunk.isFullChunkReady()) {
+ Ticket<Long> delayUnload = new Ticket<Long>(TicketType.DELAY_UNLOAD, 33, i);
+ delayUnload.delayUnloadBy = delayChunkUnloadsBy;
+ delayUnload.setCurrentTick(this.currentTick);
+ arraysetsorted.remove(delayUnload);
+ // refresh ticket
+ arraysetsorted.add(delayUnload);
+ }
+ }
+ // Paper end
}
if (arraysetsorted.isEmpty()) {
diff --git a/src/main/java/net/minecraft/server/Ticket.java b/src/main/java/net/minecraft/server/Ticket.java
index b5030d6f5d917ba33fb3c40903384fa7a56bc5f1..e41cb8613efc86499dfe3be36c9130ab6dc9b89e 100644
--- a/src/main/java/net/minecraft/server/Ticket.java
+++ b/src/main/java/net/minecraft/server/Ticket.java
@@ -9,11 +9,13 @@ public final class Ticket<T> implements Comparable<Ticket<?>> {
public final T identifier; public final T getObjectReason() { return this.identifier; } // Paper - OBFHELPER
private long d; public final long getCreationTick() { return this.d; } // Paper - OBFHELPER
public int priority = 0; // Paper
+ public long delayUnloadBy; // Paper
protected Ticket(TicketType<T> tickettype, int i, T t0) {
this.a = tickettype;
this.b = i;
this.identifier = t0;
+ this.delayUnloadBy = tickettype.loadPeriod; // Paper
}
public int compareTo(Ticket<?> ticket) {
@@ -63,7 +65,7 @@ public final class Ticket<T> implements Comparable<Ticket<?>> {
}
protected boolean b(long i) {
- long j = this.a.b();
+ long j = delayUnloadBy; // Paper
return j != 0L && i - this.d > j;
}
diff --git a/src/main/java/net/minecraft/server/TicketType.java b/src/main/java/net/minecraft/server/TicketType.java
index 6fd852db6bcfbfbf84ec2acf6d23b08a6051165c..5c789b25f1df2eae8ea8ceb4ba977ba336fe6d5e 100644
--- a/src/main/java/net/minecraft/server/TicketType.java
+++ b/src/main/java/net/minecraft/server/TicketType.java
@@ -26,6 +26,7 @@ public class TicketType<T> {
public static final TicketType<Long> ASYNC_LOAD = a("async_load", Long::compareTo); // Paper
public static final TicketType<ChunkCoordIntPair> PRIORITY = a("priority", Comparator.comparingLong(ChunkCoordIntPair::pair), 300); // Paper
public static final TicketType<ChunkCoordIntPair> URGENT = a("urgent", Comparator.comparingLong(ChunkCoordIntPair::pair), 300); // Paper
+ public static final TicketType<Long> DELAY_UNLOAD = a("delay_unload", Long::compareTo, 300); // Paper
public static <T> TicketType<T> a(String s, Comparator<T> comparator) {
return new TicketType<>(s, comparator, 0L);