Paper/patches/server/0437-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 1c39e141a392d96548f5ac62fb279ed1f105677d..922475997902dcc85ae42f351ace15e82b5aa638 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -864,7 +864,7 @@ 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;
@@ -1394,13 +1394,28 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             }
         }
 
-        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 44766ea7e5dd8f8411b52cf259187d7557cc0c23..fa7801158b68eaa12d6322c9c0def9de37f03814 100644
--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
@@ -601,6 +601,15 @@ 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 8cc266e25d25d154158b36e456804ac80a47364e..7ef0eaa6fffae02c3c27313f05eab5ae1558e948 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -1122,6 +1122,37 @@ 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.registryHolder, 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 582b9595aa06dd6787fd84c0ea0058c890f84c33..02bb4ecdc6797d1c5bccc64cc235fe63bdc7ccd4 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -179,6 +179,7 @@ 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 f37787b9d018a624b509612729f18ca077b55f55..b0120df807a61db21da04324644fbd71a285f461 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -569,6 +569,7 @@ 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
 
@@ -1171,10 +1172,22 @@ public abstract class PlayerList {
     }
 
     public void saveAll() {
+        // Paper start - incremental player saving
+        this.saveAll(-1);
+    }
+
+    public void saveAll(int interval) {
         net.minecraft.server.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