ShreddedPaper

ShreddedPaper is in public beta. Most features work for most players most of the time, however things can occasionally break.

1.20.6 Purpur fork that brings vertical scaling to Minecraft.

ShreddedPaper:

Allows multiple threads to work together to run a single world
- When ticking a chunk on one thread, all other chunks in a certain radius are locked so that only this thread has access to them, preventing any race conditions between threads.

See HOW_IT_WORKS.md for more information on how ShreddedPaper works.

Developing a plugin for a multi-threaded server

In summary, a plugin must be careful of:

Different threads updating certain data at the same time.
One thread reading data while it is being updated by another thread.
Code is to be executed on the chunk's thread, not simply the main thread.

See here for a more detailed tutorial

If your plugin already has support for Folia it is highly likely that it will already work with ShreddedPaper without any changes.
If you have a Folia check similar to the following:

try {
    Class.forName("io.papermc.paper.threadedregions.RegionizedServer");
    return true;
} catch (ClassNotFoundException e) {
    return false;
}

You should remove it and instead check of the existence of Paper's region api:

try {
    Bukkit.class.getMethod("getRegionScheduler");
    return true;
} catch (NoSuchMethodException e) {
    return false;
}

Using the ShreddedPaper API as a dependency

Add the following into your build.gradle:

repositories {
  maven {
    url "https://repo.clojars.org/"
  }
}

dependencies {
  compile "com.github.puregero:shreddedpaper-api:1.20.6-R0.1-SNAPSHOT"
}

Or in your pom.xml:

<repositories>
    <repository>
        <id>clojars</id>
        <url>https://repo.clojars.org/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>com.github.puregero</groupId>
        <artifactId>shreddedpaper-api</artifactId>
        <version>1.20.6-R0.1-SNAPSHOT</version>
    </dependency>
</dependencies>

Building

Requirements:

You need git installed, with a configured user name and email. On windows you need to run from git bash.
You need jdk 21+ installed to compile (and jre 21+ to run)

Build instructions:

Patch paper with: ./gradlew applyPatches
Build the shreddedpaper jars with: ./gradlew shadowjar createReobfPaperclipJar
Get the shreddedpaper jar from build/libs

Publishing to maven local

Publish to your local maven repository with: ./gradlew publishToMavenLocal

Note for mac users: The latest macOS version includes an incompatible version of diff and you'll need to install a compatible one. Use brew install diffutils to install it, and then reopen the terminal window.

If diff --version returns the following, it is incompatible and will not work:

Apple diff (based on FreeBSD diff)

Licensing

All code is licensed under GPLv3.

Acknowledgements

ShreddedPaper uses PaperMC's paperweight framework found here.

MultiPaper / ShreddedPaper