From c887df5ad82bfcf726617b4433c405c4b5c55acc Mon Sep 17 00:00:00 2001
From: Mike Primm <mprimm@trivatec.com>
Date: Sun, 16 Jan 2022 21:49:52 -0600
Subject: [PATCH] Limit MySQL purgemap deletes

---
 .../main/java/org/dynmap/storage/mysql/MySQLMapStorage.java   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/DynmapCore/src/main/java/org/dynmap/storage/mysql/MySQLMapStorage.java b/DynmapCore/src/main/java/org/dynmap/storage/mysql/MySQLMapStorage.java
index d3a81472..3d980af9 100644
--- a/DynmapCore/src/main/java/org/dynmap/storage/mysql/MySQLMapStorage.java
+++ b/DynmapCore/src/main/java/org/dynmap/storage/mysql/MySQLMapStorage.java
@@ -751,7 +751,9 @@ public class MySQLMapStorage extends MapStorage {
             c = getConnection();
             // Query tiles for given mapkey
             Statement stmt = c.createStatement();
-            stmt.executeUpdate("DELETE FROM " + tableTiles + " WHERE MapID=" + mapkey + ";");
+            // Limit delete to 1000 at a time (avoid locking whole table)
+            while (stmt.executeUpdate("DELETE FROM " + tableTiles + " WHERE MapID=" + mapkey + " LIMIT 1000;") > 0) {
+            }
             stmt.close();
         } catch (SQLException x) {
             Log.severe("Tile purge error - " + x.getMessage());