Update incremental chunk saving

2024-12-27 23:10:16 +01:00 · 2021-06-17 01:37:27 -07:00 · 2021-06-17 01:37:27 -07:00 · 1ffd69b7cc
commit 1ffd69b7cc
parent bd75fb2329
6 changed files with 449 additions and 7 deletions
--- a/build-data/paper.at
+++ b/build-data/paper.at
@ -191,3 +191,6 @@ public net.minecraft.world.entity.monster.Vindicator isJohnny
 public net.minecraft.server.level.Ticket createdTick
 public net.minecraft.server.level.ServerChunkCache CHUNK_STATUSES
 public net.minecraft.server.level.ChunkHolder pos
+
+# Incremental chunk saving
+public net.minecraft.world.level.entity.PersistentEntitySectionManager storeChunkSections(JLjava/util/function/Consumer;)Z
--- a/patches/server/Buffer-joins-to-world.patch
+++ b/patches/server/Buffer-joins-to-world.patch
@ -12,8 +12,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -0,0 +0,0 @@ public class PaperConfig {
-         config.set("settings.unsupported-settings.allow-headless-pistons-readme", "This setting controls if players should be able to create headless pistons.");
-         allowHeadlessPistons = getBoolean("settings.unsupported-settings.allow-headless-pistons", false);
+             maxPlayerAutoSavePerTick = (playerAutoSaveRate == -1 || playerAutoSaveRate > 100) ? 10 : 20;
+         }
     }
 +
 +    public static int maxJoinsPerTick;
--- a/patches/server/Improve-Chunk-Status-Transition-Speed.patch
+++ b/patches/server/Improve-Chunk-Status-Transition-Speed.patch
@ -40,9 +40,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/net/minecraft/server/level/ChunkHolder.java
 +++ b/src/main/java/net/minecraft/server/level/ChunkHolder.java
@@ -0,0 +0,0 @@ public class ChunkHolder {
-         this.playersInChunkTickRange = this.chunkMap.playerChunkTickRangeMap.getObjectsInRange(key);
-     }
     // Paper end - optimise isOutsideOfRange
+     long lastAutoSaveTime; // Paper - incremental autosave
+     long inactiveTimeStart; // Paper - incremental autosave
 +    // Paper start - optimize chunk status progression without jumping through thread pool
 +    public boolean canAdvanceStatus() {
 +        ChunkStatus status = getChunkHolderStatus();
--- a/patches/server/Incremental-player-saving.patch
+++ b/patches/server/Incremental-player-saving.patch
@ -0,0 +1,104 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Sun, 9 Aug 2020 08:59:25 +0300
+Subject: [PATCH] Incremental player saving
+
+
+diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
+@@ -0,0 +0,0 @@ public class PaperConfig {
+         allowPistonDuplication = getBoolean("settings.unsupported-settings.allow-piston-duplication", config.getBoolean("settings.unsupported-settings.allow-tnt-duplication", false));
+         set("settings.unsupported-settings.allow-tnt-duplication", null);
+     }
+
+    public static int playerAutoSaveRate = -1;
+    public static int maxPlayerAutoSavePerTick = 10;
+    private static void playerAutoSaveRate() {
+        playerAutoSaveRate = getInt("settings.player-auto-save-rate", -1);
+        maxPlayerAutoSavePerTick = getInt("settings.max-player-auto-save-per-tick", -1);
+        if (maxPlayerAutoSavePerTick == -1) { // -1 Automatic / "Recommended"
+            // 10 should be safe for everyone unless you mass spamming player auto save
+            maxPlayerAutoSavePerTick = (playerAutoSaveRate == -1 || playerAutoSaveRate > 100) ? 10 : 20;
+        }
+    }
+ }
+diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
+@@ -0,0 +0,0 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
+ 
+         if (this.playerList != null) {
+             MinecraftServer.LOGGER.info("Saving players");
+-            this.playerList.saveAll();
+             this.playerList.removeAll(this.isRestarting); // Paper
+             try { Thread.sleep(100); } catch (InterruptedException ex) {} // CraftBukkit - SPIGOT-625 - give server at least a chance to send packets
+         }
+@@ -0,0 +0,0 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
+         // if (this.autosavePeriod > 0 && this.tickCount % this.autosavePeriod == 0) { // CraftBukkit // Paper - move down
+         //     MinecraftServer.LOGGER.debug("Autosave started"); // Paper
+         serverAutoSave = (autosavePeriod > 0 && this.tickCount % autosavePeriod == 0); // Paper
+        // Paper start
+        int playerSaveInterval = com.destroystokyo.paper.PaperConfig.playerAutoSaveRate;
+        if (playerSaveInterval < 0) {
+            playerSaveInterval = autosavePeriod;
+        }
+        // Paper end
+             this.profiler.push("save");
+-        if (this.autosavePeriod > 0 && this.tickCount % this.autosavePeriod == 0) { // Paper - moved from above
+-            this.playerList.saveAll();
+        if (playerSaveInterval > 0) { // Paper
+            this.playerList.savePlayers(playerSaveInterval); // Paper
+             // this.saveAllChunks(true, false, false); // Paper - saved incrementally below
+         } // Paper start
+         for (ServerLevel level : this.getAllLevels()) {
+diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
+@@ -0,0 +0,0 @@ public class ServerPlayer extends Player {
+     public final int getViewDistance() { return this.getLevel().getChunkSource().chunkMap.viewDistance - 1; } // Paper - placeholder
+ 
+     private static final Logger LOGGER = LogManager.getLogger();
+    public long lastSave = MinecraftServer.currentTick; // Paper
+     private static final int NEUTRAL_MOB_DEATH_NOTIFICATION_RADII_XZ = 32;
+     private static final int NEUTRAL_MOB_DEATH_NOTIFICATION_RADII_Y = 10;
+     public ServerGamePacketListenerImpl connection;
+diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
+@@ -0,0 +0,0 @@ public abstract class PlayerList {
+     protected void save(ServerPlayer player) {
+         if (!player.getBukkitEntity().isPersistent()) return; // CraftBukkit
+         if (!player.didPlayerJoinEvent) return; // Paper - If we never fired PJE, we disconnected during login. Data has not changed, and additionally, our saved vehicle is not loaded! If we save now, we will lose our vehicle (CraftBukkit bug)
+        player.lastSave = MinecraftServer.currentTick; // Paper
+         this.playerIo.save(player);
+         ServerStatsCounter serverstatisticmanager = (ServerStatsCounter) player.getStats(); // CraftBukkit
+ 
+@@ -0,0 +0,0 @@ public abstract class PlayerList {
+     }
+ 
+     public void saveAll() {
+-        net.minecraft.server.MCUtil.ensureMain("Save Players" , () -> { // Paper - Ensure main
+        // Paper start - incremental player saving
+        savePlayers(null);
+    }
+    public void savePlayers(Integer interval) {
+        MCUtil.ensureMain("Save Players" , () -> { // Paper - Ensure main
+         MinecraftTimings.savePlayers.startTiming(); // Paper
+        int numSaved = 0;
+        long now = MinecraftServer.currentTick;
+         for (int i = 0; i < this.players.size(); ++i) {
+-            this.save(this.players.get(i));
+            ServerPlayer entityplayer = this.players.get(i);
+            if (interval == null || now - entityplayer.lastSave >= interval) {
+                this.save(entityplayer);
+                if (interval != null && ++numSaved <= com.destroystokyo.paper.PaperConfig.maxPlayerAutoSavePerTick) { break; }
+            }
+            // Paper end
+         }
+         MinecraftTimings.savePlayers.stopTiming(); // Paper
+         return null; }); // Paper - ensure main
--- a/patches/server/Prevent-headless-pistons-from-being-created.patch
+++ b/patches/server/Prevent-headless-pistons-from-being-created.patch
@ -10,16 +10,18 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -0,0 +0,0 @@ public class PaperConfig {
-         allowPistonDuplication = getBoolean("settings.unsupported-settings.allow-piston-duplication", config.getBoolean("settings.unsupported-settings.allow-tnt-duplication", false));
         set("settings.unsupported-settings.allow-tnt-duplication", null);
     }
-+
+ 
 +    public static boolean allowHeadlessPistons;
 +    private static void allowHeadlessPistons() {
 +        config.set("settings.unsupported-settings.allow-headless-pistons-readme", "This setting controls if players should be able to create headless pistons.");
 +        allowHeadlessPistons = getBoolean("settings.unsupported-settings.allow-headless-pistons", false);
 +    }
- }
+
+     public static int playerAutoSaveRate = -1;
+     public static int maxPlayerAutoSavePerTick = 10;
+     private static void playerAutoSaveRate() {
 diff --git a/src/main/java/net/minecraft/world/level/Explosion.java b/src/main/java/net/minecraft/world/level/Explosion.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/world/level/Explosion.java
--- a/patches/server/incremental-chunk-saving.patch
+++ b/patches/server/incremental-chunk-saving.patch
@ -0,0 +1,333 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shane Freeder <theboyetronic@gmail.com>
+Date: Sun, 9 Jun 2019 03:53:22 +0100
+Subject: [PATCH] incremental chunk saving
+
+
+diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+@@ -0,0 +0,0 @@ public class PaperWorldConfig {
+         log( "Keep Spawn Loaded Range: " + (keepLoadedRange/16));
+     }
+ 
+    public int autoSavePeriod = -1;
+    private void autoSavePeriod() {
+        autoSavePeriod = getInt("auto-save-interval", -1);
+        if (autoSavePeriod > 0) {
+            log("Auto Save Interval: " +autoSavePeriod + " (" + (autoSavePeriod / 20) + "s)");
+        } else if (autoSavePeriod < 0) {
+            autoSavePeriod = net.minecraft.server.MinecraftServer.getServer().autosavePeriod;
+        }
+    }
+
+    public int maxAutoSaveChunksPerTick = 24;
+    private void maxAutoSaveChunksPerTick() {
+        maxAutoSaveChunksPerTick = getInt("max-auto-save-chunks-per-tick", 24);
+    }
+
+     private boolean getBoolean(String path, boolean def) {
+         config.addDefault("world-settings.default." + path, def);
+         return config.getBoolean("world-settings." + worldName + "." + path, config.getBoolean("world-settings.default." + path));
+diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
+@@ -0,0 +0,0 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
+     public static int currentTick = 0; // Paper - Further improve tick loop
+     public java.util.Queue<Runnable> processQueue = new java.util.concurrent.ConcurrentLinkedQueue<Runnable>();
+     public int autosavePeriod;
+    public boolean serverAutoSave = false; // Paper
+     public Commands vanillaCommandDispatcher;
+     public boolean forceTicks; // Paper
+     // CraftBukkit end
+@@ -0,0 +0,0 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
+             this.status.getPlayers().setSample(agameprofile);
+         }
+ 
+-        if (this.autosavePeriod > 0 && this.tickCount % this.autosavePeriod == 0) { // CraftBukkit
+-            MinecraftServer.LOGGER.debug("Autosave started");
+        // if (this.autosavePeriod > 0 && this.tickCount % this.autosavePeriod == 0) { // CraftBukkit // Paper - move down
+        //     MinecraftServer.LOGGER.debug("Autosave started"); // Paper
+        serverAutoSave = (autosavePeriod > 0 && this.tickCount % autosavePeriod == 0); // Paper
+             this.profiler.push("save");
+        if (this.autosavePeriod > 0 && this.tickCount % this.autosavePeriod == 0) { // Paper - moved from above
+             this.playerList.saveAll();
+-            this.saveAllChunks(true, false, false);
+-            this.profiler.pop();
+-            MinecraftServer.LOGGER.debug("Autosave finished");
+            // this.saveAllChunks(true, false, false); // Paper - saved incrementally below
+        } // Paper start
+        for (ServerLevel level : this.getAllLevels()) {
+            if (level.paperConfig.autoSavePeriod > 0) {
+                level.saveIncrementally(this.serverAutoSave);
+            }
+         }
+        // Paper end
+            this.profiler.pop();
+            // MinecraftServer.LOGGER.debug("Autosave finished"); // Paper
+        //} // Paper
+ 
+         this.profiler.push("snooper");
+         if (((DedicatedServer) this).getProperties().snooperEnabled && !this.snooper.isStarted() && this.tickCount > 100) { // Spigot
+diff --git a/src/main/java/net/minecraft/server/level/ChunkHolder.java b/src/main/java/net/minecraft/server/level/ChunkHolder.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/level/ChunkHolder.java
+++ b/src/main/java/net/minecraft/server/level/ChunkHolder.java
+@@ -0,0 +0,0 @@ public class ChunkHolder {
+         this.playersInChunkTickRange = this.chunkMap.playerChunkTickRangeMap.getObjectsInRange(key);
+     }
+     // Paper end - optimise isOutsideOfRange
+    long lastAutoSaveTime; // Paper - incremental autosave
+    long inactiveTimeStart; // Paper - incremental autosave
+ 
+     public ChunkHolder(ChunkPos pos, int level, LevelHeightAccessor world, LevelLightEngine lightingProvider, ChunkHolder.LevelChangeListener levelUpdateListener, ChunkHolder.PlayerProvider playersWatchingChunkProvider) {
+         this.futures = new AtomicReferenceArray(ChunkHolder.CHUNK_STATUSES.size());
+@@ -0,0 +0,0 @@ public class ChunkHolder {
+         boolean flag2 = playerchunk_state.isOrAfter(ChunkHolder.FullChunkStatus.BORDER);
+         boolean flag3 = playerchunk_state1.isOrAfter(ChunkHolder.FullChunkStatus.BORDER);
+ 
+        boolean prevHasBeenLoaded = this.wasAccessibleSinceLastSave; // Paper
+         this.wasAccessibleSinceLastSave |= flag3;
+        // Paper start - incremental autosave
+        if (this.wasAccessibleSinceLastSave & !prevHasBeenLoaded) {
+            long timeSinceAutoSave = this.inactiveTimeStart - this.lastAutoSaveTime;
+            if (timeSinceAutoSave < 0) {
+                // safest bet is to assume autosave is needed here
+                timeSinceAutoSave = this.chunkMap.level.paperConfig.autoSavePeriod;
+            }
+            this.lastAutoSaveTime = this.chunkMap.level.getGameTime() - timeSinceAutoSave;
+            this.chunkMap.autoSaveQueue.add(this);
+        }
+        // Paper end
+         if (!flag2 && flag3) {
+             int expectCreateCount = ++this.fullChunkCreateCount; // Paper
+             this.fullChunkFuture = chunkStorage.prepareAccessibleChunk(this);
+@@ -0,0 +0,0 @@ public class ChunkHolder {
+     }
+ 
+     public void refreshAccessibility() {
+        boolean prev = this.wasAccessibleSinceLastSave; // Paper
+         this.wasAccessibleSinceLastSave = ChunkHolder.getFullChunkStatus(this.ticketLevel).isOrAfter(ChunkHolder.FullChunkStatus.BORDER);
+        // Paper start - incremental autosave
+        if (prev != this.wasAccessibleSinceLastSave) {
+            if (this.wasAccessibleSinceLastSave) {
+                long timeSinceAutoSave = this.inactiveTimeStart - this.lastAutoSaveTime;
+                if (timeSinceAutoSave < 0) {
+                    // safest bet is to assume autosave is needed here
+                    timeSinceAutoSave = this.chunkMap.level.paperConfig.autoSavePeriod;
+                }
+                this.lastAutoSaveTime = this.chunkMap.level.getGameTime() - timeSinceAutoSave;
+                this.chunkMap.autoSaveQueue.add(this);
+            } else {
+                this.inactiveTimeStart = this.chunkMap.level.getGameTime();
+                this.chunkMap.autoSaveQueue.remove(this);
+            }
+        }
+        // Paper end
+     }
+ 
+    // Paper start - incremental autosave
+    public boolean setHasBeenLoaded() {
+        this.wasAccessibleSinceLastSave = getFullChunkStatus(this.ticketLevel).isOrAfter(ChunkHolder.FullChunkStatus.BORDER);
+        return this.wasAccessibleSinceLastSave;
+    }
+    // Paper end
+
+     public void replaceProtoChunk(ImposterProtoChunk chunk) {
+         for (int i = 0; i < this.futures.length(); ++i) {
+             CompletableFuture<Either<ChunkAccess, ChunkHolder.ChunkLoadingFailure>> completablefuture = (CompletableFuture) this.futures.get(i);
+diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
+@@ -0,0 +0,0 @@ import net.minecraft.world.level.levelgen.structure.templatesystem.StructureMana
+ import net.minecraft.world.level.storage.DimensionDataStorage;
+ import net.minecraft.world.level.storage.LevelStorageSource;
+ import net.minecraft.world.phys.Vec3;
+import it.unimi.dsi.fastutil.objects.ObjectRBTreeSet; // Paper
+ import org.apache.commons.lang3.mutable.MutableBoolean;
+ import org.apache.logging.log4j.LogManager;
+ import org.apache.logging.log4j.Logger;
+@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
+ 
+     }
+ 
+    // Paper start - incremental autosave
+    final ObjectRBTreeSet<ChunkHolder> autoSaveQueue = new ObjectRBTreeSet<>((playerchunk1, playerchunk2) -> {
+        int timeCompare =  Long.compare(playerchunk1.lastAutoSaveTime, playerchunk2.lastAutoSaveTime);
+        if (timeCompare != 0) {
+            return timeCompare;
+        }
+
+        return Long.compare(MCUtil.getCoordinateKey(playerchunk1.pos), MCUtil.getCoordinateKey(playerchunk2.pos));
+    });
+
+    protected void saveIncrementally() {
+        int savedThisTick = 0;
+        // optimized since we search far less chunks to hit ones that need to be saved
+        List<ChunkHolder> reschedule = new java.util.ArrayList<>(this.level.paperConfig.maxAutoSaveChunksPerTick);
+        long currentTick = this.level.getGameTime();
+        long maxSaveTime = currentTick - this.level.paperConfig.autoSavePeriod;
+
+        for (Iterator<ChunkHolder> iterator = this.autoSaveQueue.iterator(); iterator.hasNext();) {
+            ChunkHolder playerchunk = iterator.next();
+            if (playerchunk.lastAutoSaveTime > maxSaveTime) {
+                break;
+            }
+
+            iterator.remove();
+
+            ChunkAccess ichunkaccess = playerchunk.getChunkToSave().getNow(null);
+            if (ichunkaccess instanceof LevelChunk) {
+                boolean shouldSave = ((LevelChunk)ichunkaccess).lastSaveTime <= maxSaveTime;
+
+                if (shouldSave && this.save(ichunkaccess) && this.level.entityManager.storeChunkSections(playerchunk.pos.toLong(), entity -> {})) {
+                    ++savedThisTick;
+
+                    if (!playerchunk.setHasBeenLoaded()) {
+                        // do not fall through to reschedule logic
+                        playerchunk.inactiveTimeStart = currentTick;
+                        if (savedThisTick >= this.level.paperConfig.maxAutoSaveChunksPerTick) {
+                            break;
+                        }
+                        continue;
+                    }
+                }
+            }
+
+            reschedule.add(playerchunk);
+
+            if (savedThisTick >= this.level.paperConfig.maxAutoSaveChunksPerTick) {
+                break;
+            }
+        }
+
+        for (int i = 0, len = reschedule.size(); i < len; ++i) {
+            ChunkHolder playerchunk = reschedule.get(i);
+            playerchunk.lastAutoSaveTime = this.level.getGameTime();
+            this.autoSaveQueue.add(playerchunk);
+        }
+    }
+    // Paper end
+
+     protected void saveAllChunks(boolean flush) {
+         Long2ObjectLinkedOpenHashMap<ChunkHolder> visibleChunks = this.getVisibleChunks(); // Paper remove clone of visible Chunks unless saving off main thread (watchdog kill)
+         if (flush) {
+@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
+             asyncSaveData, chunk);
+ 
+         chunk.setUnsaved(false);
+        chunk.setLastSaved(this.level.getGameTime()); // Paper - track last saved time
+     }
+     // Paper end
+ 
+@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
+ 
+                         this.level.unload(chunk);
+                     }
+                    this.autoSaveQueue.remove(holder); // Paper
+ 
+                     this.lightEngine.updateChunkStatus(ichunkaccess.getPos());
+                     this.lightEngine.tryScheduleUpdate();
+@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
+         if (!chunk.isUnsaved()) {
+             return false;
+         } else {
+            chunk.setLastSaved(this.level.getGameTime()); // Paper - track save time
+             chunk.setUnsaved(false);
+             ChunkPos chunkcoordintpair = chunk.getPos();
+ 
+diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+@@ -0,0 +0,0 @@ public class ServerChunkCache extends ChunkSource {
+         } // Paper - Timings
+     }
+ 
+    // Paper start - duplicate save, but call incremental
+    public void saveIncrementally() {
+        this.runDistanceManagerUpdates();
+        try (co.aikar.timings.Timing timed = level.timings.chunkSaveData.startTiming()) { // Paper - Timings
+            this.chunkMap.saveIncrementally();
+        } // Paper - Timings
+    }
+    // Paper end
+
+     @Override
+     public void close() throws IOException {
+         // CraftBukkit start
+diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
+@@ -0,0 +0,0 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
+         return !this.server.isUnderSpawnProtection(this, pos, player) && this.getWorldBorder().isWithinBounds(pos);
+     }
+ 
+    // Paper start - derived from below
+    public void saveIncrementally(boolean doFull) {
+        ServerChunkCache chunkproviderserver = this.getChunkSource();
+
+        if (doFull) {
+            org.bukkit.Bukkit.getPluginManager().callEvent(new org.bukkit.event.world.WorldSaveEvent(getWorld()));
+        }
+
+        try (co.aikar.timings.Timing ignored = this.timings.worldSave.startTiming()) {
+            if (doFull) {
+                this.saveLevelData();
+            }
+
+            this.timings.worldSaveChunks.startTiming(); // Paper
+            if (!this.noSave()) chunkproviderserver.saveIncrementally();
+            this.timings.worldSaveChunks.stopTiming(); // Paper
+
+            // Copied from save()
+            // CraftBukkit start - moved from MinecraftServer.saveChunks
+            if (doFull) { // Paper
+                ServerLevel worldserver1 = this;
+
+                this.serverLevelData.setWorldBorder(worldserver1.getWorldBorder().createSettings());
+                this.serverLevelData.setCustomBossEvents(this.server.getCustomBossEvents().save());
+                this.convertable.saveDataTag(this.server.registryHolder, this.serverLevelData, this.server.getPlayerList().getSingleplayerData());
+            }
+            // CraftBukkit end
+        }
+    }
+    // Paper end
+
+     public void save(@Nullable ProgressListener progressListener, boolean flush, boolean flag1) {
+         ServerChunkCache chunkproviderserver = this.getChunkSource();
+ 
+diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java b/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
+@@ -0,0 +0,0 @@ public interface ChunkAccess extends BlockGetter, FeatureAccess {
+         return GameEventDispatcher.NOOP;
+     }
+ 
+    default void setLastSaved(long ticks) {}
+     // Paper start
+     default boolean generateFlatBedrock() {
+         if (this instanceof ProtoChunk) {
+diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+@@ -0,0 +0,0 @@ public class LevelChunk implements ChunkAccess {
+     private final ShortList[] postProcessing;
+     private TickList<Block> blockTicks;
+     private TickList<Fluid> liquidTicks;
+    // Paper start - track last save time
+    public long lastSaveTime;
+    @Override
+    public void setLastSaved(long ticks) {
+        this.lastSaveTime = ticks;
+    }
+    // Paper end
+     private volatile boolean unsaved;
+     private long inhabitedTime;
+     @Nullable