PaperMC/patches/server-remapped/0540-Incremental-player-saving.patch

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 b67ba8f75e4a3358d7c2462918b85b0bf9b5a922..fdbd8b89bb8bf3b61f60b812b90483c98a3d5ccb 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -440,4 +440,15 @@ 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 19544b794b5a46c129016172798ff7294fcfed33..735c3c983e96e4e6f36de0975909fc48cb042081 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1347,9 +1347,15 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         //if (autosavePeriod > 0 && this.ticks % 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 (autosavePeriod > 0 && this.tickCount % autosavePeriod == 0) { // Paper
-            this.playerList.saveAll();
+            if (playerSaveInterval > 0) { // Paper
+            this.playerList.savePlayers(playerSaveInterval); // Paper
             }// Paper
             // Paper start
             for (ServerLevel world : getAllLevels()) {
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index c5717f45a0110492aad41f21cc06fb8cbeb1f791..bd4d4ace35e966e819aa461d3962fe06ff402be7 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -173,6 +173,7 @@ import org.bukkit.inventory.MainHand;
 public class ServerPlayer extends Player implements ContainerListener {
 
     private static final Logger LOGGER = LogManager.getLogger();
+    public long lastSave = MinecraftServer.currentTick; // Paper
     public ServerGamePacketListenerImpl connection;
     public Connection networkManager; // Paper
     public final MinecraftServer server;
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index 882cd25c9610f0b995c27291aa62846922ab531f..b76735531ef96f9d4c870a5107feea01524a7670 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -559,6 +559,7 @@ 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
 
@@ -1218,10 +1219,21 @@ public abstract class PlayerList {
     }
 
     public void saveAll() {
+        // 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((ServerPlayer) 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