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Cesium Storage Format

EXPERIMENTAL: Highly unstable alternative world format for Minecraft. Here be dragons.

15.4k
87
Cursed

Compatibility

Minecraft: Java Edition

24w34a
1.21.x
1.20.4–1.20.6
1.20–1.20.2

Platforms

Fabric
Quilt

Supported environments

Server-side

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Links

Report issues View source Visit wiki

Creators

CesiumMCOrganization

Details

Licensed LGPL-3.0-only
Published 2 years ago
Updated last week
DescriptionGalleryChangelogVersions

Show all versions

Cesium 0.2.6 for Minecraft 1.21.5 - 1.21.7

on Jun 30, 2025
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What's Changed

  • Update dependencies

Full Changelog: https://github.com/CesiumMC/cesium-fabric/compare/0.2.5...0.2.6

Cesium 0.2.5 for Minecraft 1.21.5

on Mar 25, 2025
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Cesium 0.2.5 for Minecraft 1.21.4

on Dec 3, 2024
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What's Changed

  • Committing data should no longer block the server thread.
  • Decompression should no longer block other threads from reading data.
  • Reduce default compression level from 12 to 8 (not changed automatically for older config files).
  • Smaller changes for easier back porting to older versions.

Full Changelog: https://github.com/CesiumMC/cesium-fabric/compare/0.2.4+1.20.6-1.21.1...0.2.5

Cesium 0.2.5 for Minecraft 1.21.2 - 1.21.3

on Oct 23, 2024
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Cesium 0.2.5 for Minecraft 1.20.1

on Oct 22, 2024
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What's Changed

  • Committing data should no longer block the server thread.
  • Decompression should no longer block other threads from reading data.
  • Reduce default compression level from 12 to 8 (not changed automatically for older config files).
  • Smaller changes for easier back porting to older versions.

Supported game versions

  • 1.20.1
  • 1.20.4
  • 1.20.6-1.21.1
  • 1.21.2-1.21.3

Full Changelog: https://github.com/CesiumMC/cesium-fabric/compare/0.2.4+1.20.6-1.21.1...0.2.5

Cesium 0.2.5 for Minecraft 1.20.4

on Oct 22, 2024
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Cesium 0.2.5 for Minecraft 1.20.6-1.21.1

on Oct 22, 2024
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What's Changed

  • Committing data should no longer block the server thread.
  • Decompression should no longer block other threads from reading data.
  • Reduce default compression level from 12 to 8 (not changed automatically for older config files).
  • Smaller changes for easier back porting to older versions.

Supported game versions

  • 1.20.1
  • 1.20.4
  • 1.20.6-1.21.1
  • 1.21.2-1.21.3

Full Changelog: https://github.com/yamayaki1/cesium-fabric/compare/0.2.4+1.20.6-1.21.1...0.2.5

Cesium 0.2.4 for Minecraft Release 1.20.6 to 1.21.1

on Sep 12, 2024
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What's Changed

  • Improve world conversion speed

Known issues

  • There are currently no known issues

Full Changelog: 0.2.3+1.20.6-1.21.1...0.2.4+1.20.6-1.21.1

Cesium 0.2.3 for Minecraft 1.20.6 to 1.21.1

on Aug 9, 2024
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What's Changed

  • Allow to run on Minecraft 1.21.1
  • Ignore unrelated files in the player data directory (#13)

Known issues

  • There are currently no known issues

Full Changelog: 0.2.2+1.20.6+1.21...0.2.3+1.20.6-1.21.1

Cesium 0.2.2 for Minecraft 1.20.6 & 1.21

on Jun 13, 2024
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What's Changed

  • Allow to run on Minecraft 1.21 prereleases
  • Update zstd to version 1.5.6
  • New submenu in edit world screen that hosts all maintenance tasks
  • Add new button in maintenance screen to start compaction of database
  • Add new server startup flags to start conversion of worlds on the dedicated server [#5] (--cesiumConvertToAnvil, --cesiumConvertToCesium)

Known issues

  • There are currently no known issues

Full Changelog: 0.2.1+1.20.6...0.2.2+1.20.6+1.21

Cesium 0.2.1 for Minecraft Release 1.20.6

on Apr 30, 2024
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What's Changed

  • Update to Minecraft 1.20.6
  • Add option to enable force data save after tick (introduced in 2.0.0)

Known issues

  • There are currently no known issues

Full Changelog: 0.2.0+1.20.5...0.2.1+1.20.6

Cesium 0.2.0 for Minecraft Release 1.20.5

on Apr 23, 2024
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What's Changed

  • Update to Minecraft 1.20.5
  • Code refactors

Known issues

  • Cesium takes up a large amount of time per server tick

Full Changelog: 0.1.8+1.20.4...0.2.0+1.20.5

Cesium 0.1.8 for Minecraft Release 1.20.4

on Mar 3, 2024
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What's Changed

  • Fix compatibility with mods which rely on the IOWorker class.
  • Add option to disable debug information.
  • Don't flush data if transaction is empty.
  • Make world conversion multi threaded.
  • Make chunk saving async.

Known issues

  • There are currently no known issues

Full Changelog: 0.1.7+1.20.4...0.1.8+1.20.4

Cesium 0.1.7 for Minecraft Release 1.20.4

on Dec 7, 2023
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Additional changes

  • Updated the mod to support Minecraft 1.20.4

Known issues

There are currently no known issues

Full Changelog: 0.1.7+1.20.2...0.1.7+1.20.4

Cesium 0.1.7 for Minecraft 1.20.2

on Oct 21, 2023
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Additional changes

  • Fixed a crash when trying to load a world in a non-dev environment.
  • Added debug statistics to the F3 menu.
  • Zstd dictionary is no longer experimental, added code to be able to switch between dictionary and no dictionary.
  • Flush all data after server tick

Known issues

The are currently no known issues.

Full Changelog: 0.1.6+1.20.2...0.1.7+1.20.2

Cesium 0.1.6 for Minecraft 1.20.2

on Sep 21, 2023
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Additional changes

  • Updated the mod to support Minecraft 1.20.2

Known issues

  • Crashes when not in a dev environment.

Full Changelog: https://github.com/yamayaki1/cesium-fabric/compare/0.1.6+1.20.x...0.1.6+1.20.2

Cesium 0.1.6 for Minecraft 1.20.x

on Aug 21, 2023
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This release fixes a mod incompatibility.

Additional changes

  • Fixes a crash when trying to open a world with owo-lib installed.

Known issues

There are currently no known issues.

Full Changelog: https://github.com/yamayaki1/cesium-fabric/compare/0.1.5+1.20.x...0.1.6+1.20.x

Cesium 0.1.5 for Minecraft 1.20.x

on Aug 13, 2023
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This release adds a new experimental setting for enabling zstd compression using a dictionary.

Additional changes

  • Improvements to how transactions are handled when flushing changes to disk.
  • Writing data to disk no longer blocks other threads from adding new changes to transactions.
  • Rewrite some Mixins to not duplicate Vanilla logic.

Known issues

  • The game crashes when trying to open a world with owo-lib

Full Changelog: https://github.com/yamayaki1/cesium-fabric/compare/0.1.4+1.20.x...0.1.5+1.20.x

Cesium 0.1.4 for Minecraft 1.20.x

on Jul 6, 2023
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This release allows the mod to be used on 1.20 and 1.20.1.

Full Changelog: https://github.com/yamayaki1/cesium-fabric/compare/0.1.4+1.20...0.1.4+1.20.x

Cesium 0.1.4 for Minecraft 1.20

on Jun 9, 2023
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This is the first release for Minecraft 1.20. Please report any bugs.

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