Paper/patches/server/0432-incremental-chunk-and-player-saving.patch

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 and player saving


diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 55625495437e94d5dc98fabe68550f68b318381f..4fec26c84cb435756fe4b2dcdfc90716f342f9f1 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -875,7 +875,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
 
         try {
             this.isSaving = true;
-            this.getPlayerList().saveAll();
+            this.getPlayerList().saveAll(); // Diff on change
             flag3 = this.saveAllChunks(suppressLogs, flush, force);
         } finally {
             this.isSaving = false;
@@ -1384,13 +1384,28 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             this.status = this.buildServerStatus();
         }
 
-        if (this.autosavePeriod > 0 && this.tickCount % this.autosavePeriod == 0) { // CraftBukkit
-            MinecraftServer.LOGGER.debug("Autosave started");
-            this.profiler.push("save");
-            this.saveEverything(true, false, false);
-            this.profiler.pop();
-            MinecraftServer.LOGGER.debug("Autosave finished");
+        // Paper start - incremental chunk and player saving
+        int playerSaveInterval = io.papermc.paper.configuration.GlobalConfiguration.get().playerAutoSave.rate;
+        if (playerSaveInterval < 0) {
+            playerSaveInterval = autosavePeriod;
         }
+        this.profiler.push("save");
+        final boolean fullSave = autosavePeriod > 0 && this.tickCount % autosavePeriod == 0;
+        try {
+            this.isSaving = true;
+            if (playerSaveInterval > 0) {
+                this.playerList.saveAll(playerSaveInterval);
+            }
+            for (ServerLevel level : this.getAllLevels()) {
+                if (level.paperConfig().chunks.autoSaveInterval.value() > 0) {
+                    level.saveIncrementally(fullSave);
+                }
+            }
+        } finally {
+            this.isSaving = false;
+        }
+        this.profiler.pop();
+        // Paper end
         io.papermc.paper.util.CachedLists.reset(); // Paper
         // Paper start - move executeAll() into full server tick timing
         try (co.aikar.timings.Timing ignored = MinecraftTimings.processTasksTimer.startTiming()) {
diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
index 298e4468f7b5346733257f7117f76c66e9a1d8f0..d1652c237b2b272f0dfe80f774cff16056f39046 100644
--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
@@ -602,6 +602,15 @@ 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 51e8070864ffc4a35377021a7ded9813a40c1a11..06d20e9fde26540d1575975345f3d69405f767d0 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -1140,6 +1140,37 @@ public class ServerLevel extends Level implements WorldGenLevel {
         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.registryAccess(), this.serverLevelData, this.server.getPlayerList().getSingleplayerData());
+            }
+            // CraftBukkit end
+        }
+    }
+    // Paper end
+
     public void save(@Nullable ProgressListener progressListener, boolean flush, boolean savingDisabled) {
         // Paper start - rewrite chunk system - add close param
         this.save(progressListener, flush, savingDisabled, false);
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index 2c052d0a8c6d58ad8eae41c22c753327342e90f1..5b6ecebcb4585877a2761eb17f4810042320e681 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -189,6 +189,7 @@ import org.bukkit.inventory.MainHand;
 public class ServerPlayer extends Player {
 
     private static final Logger LOGGER = LogUtils.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 0e2a84148e721a8f799f0746e379c16a5f7f0dd3..44ead3a9831d913f7337a447b73a94e06fb0f06a 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -528,6 +528,7 @@ public abstract class PlayerList {
 
     protected void save(ServerPlayer player) {
         if (!player.getBukkitEntity().isPersistent()) return; // CraftBukkit
+        player.lastSave = MinecraftServer.currentTick; // Paper
         this.playerIo.save(player);
         ServerStatsCounter serverstatisticmanager = (ServerStatsCounter) player.getStats(); // CraftBukkit
 
@@ -1118,10 +1119,22 @@ public abstract class PlayerList {
     }
 
     public void saveAll() {
+        // Paper start - incremental player saving
+        this.saveAll(-1);
+    }
+
+    public void saveAll(int interval) {
         io.papermc.paper.util.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 == -1 || now - entityplayer.lastSave >= interval) {
+                this.save(entityplayer);
+                if (interval != -1 && ++numSaved <= io.papermc.paper.configuration.GlobalConfiguration.get().playerAutoSave.maxPerTick()) { break; }
+            }
+            // Paper end
         }
         MinecraftTimings.savePlayers.stopTiming(); // Paper
         return null; }); // Paper - ensure main