57f7925c2f
MySQL connection string optimizations: - rewriteBatchedStatements=true: rewrites batch INSERTs into multi-row (5-30x) - cachePrepStmts=true + useServerPrepStmts=true: server-side prepared statement caching, avoids re-parsing identical queries (15-25% CPU reduction) - prepStmtCacheSize=256: keeps 256 compiled statements warm - useCompression=true: compresses network traffic (40-60% for large NBT blobs) - tcpNoDelay=true: disables Nagle's algorithm for lower latency Batch transaction for writeSnapshotToDB: - New JDBCsetUp.executeBatchTransaction() executes multiple SQL statements in a SINGLE transaction on ONE connection with automatic rollback. - writeSnapshotToDB now batches all 4-8 queries (player_data + curios + mod_player_data) into one connection borrow + one commit. - Previous: 4-8 separate getConnection() + executeUpdate() + close() calls per player save = 4-8 network round-trips. - Now: 1 getConnection() + N executeUpdate() + 1 commit() + 1 close() = 1 network round-trip for the transaction. - With 35 players: 140-280 connection borrows → 35 connection borrows. HikariCP leak detection: - Added leakDetectionThreshold=10000ms to detect connections held > 10s Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> |
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PlayerSync
PlayerSync is a Minecraft Forge mod that synchronizes player data across multiple servers using a MySQL backend. It allows players to maintain their inventory, equipment, experience, advancements, and more when moving between servers in a network.
Mod Support
Any other mods support is also possible.
Development Setup
Database Setup (Docker)
A docker-compose.yml file is provided for easily setting up a MariaDB database instance for development testing.
- Make sure Docker is installed.
- Inside your work directory run:
This will download the MariaDB image (if not already present) and start a database container in the background.docker compose up -d - Stoppinng the Database
docker compose down
Data Persistence: The database uses a Docker volume, ensuring your data persists even if you stop and restart the containers.
Database Management Tool
The docker-compose.yml also includes an Adminer service, a lightweight database management tool.
- Access Adminer in your web browser at http://localhost:8080.
- Log in using the server with
- username:
playersync - database:
playersync - password: see docker-compose.yml
- username:
For debugging purposes, you can enable use_legacy_serialization to have readable database fields. This can cause crashes and unintended side-effects. Do not enable this on a production server if not absolutely necessary!
Running the Mod
The project uses Gradle for building and running. Use the provided Gradle wrapper (gradlew for Linux/macOS, gradlew.bat for Windows).
- Make sure that the MySQL database you configured is running.
- Run the Server
or on Windows:./gradlew runServer
This task compiles the mod and starts a dedicated Minecraft server instance with the mod loaded in the.\gradlew.bat runServerrundirectory. - Run the Client
or on Windows:./gradlew runClient.\gradlew.bat runClient