Author Archives: janlehn

3.5.1

Dear community,

Apache CouchDB® 3.5.1 has been released and is available for download.

CouchDB 3.5.1 is a maintenance release, and was originally published on 2025-11-11.

https://couchdb.apache.org/#download

Pre-built packages for Windows, macOS, Debian/Ubuntu and RHEL/CentOS, as well as Docker images are available.

Release Notes highlights:

  • Native support for UUIDv7 automatic _id generation
  • Various performance improvements for purge, bulk endpoints and btree caching
  • A large number of clean ups and bug fixes

Special Notice Heads Up:

  • The next feature version of CouchDB (3.6.0) will switch to using the QuickJS engine for all JavaScript operations by default. SpiderMonkey will remain available on supported platforms, but it is causing an increasing strain on testing and release engineering, so the project is starting to make the switch.
  • To ready yourself for the upgrade, you can run the new Background Scanner feature1 and have your existing JavaScript code be analysed to see if it will behave as expected under QuickJS. Modern JavaScript running on modern (> version 1.8.5) SpiderMonkey should translate seamlessly. Refer to our documented list2 of differences between various engine types and versions.
  • Please note that due to platform support, RHEL 10 and AlmaLinux 10 binaries of 3.5.1 are already only shipping with QuickJS.

See the official release notes document for an exhaustive list of all changes:

https://docs.couchdb.org/en/stable/whatsnew/3.5.html

Apache CouchDB® lets you access your data where you need it. The Couch Replication Protocol is implemented in a variety of projects and products that span every imaginable computing environment from globally distributed server-clusters, over mobile phones to web browsers.

Store your data safely, on your own servers, or with any leading cloud provider. Your web- and native applications love CouchDB, because it speaks JSON natively and supports binary data for all your data storage needs.

The Couch Replication Protocol lets your data flow seamlessly between server clusters to mobile phones and web browsers, enabling a compelling offline-first user-experience while maintaining high performance and strong reliability. CouchDB comes with a developer-friendly query language, and optionally MapReduce for simple, efficient, and comprehensive data retrieval.

The community would like to thank all contributors for their part in making this release, from the smallest bug report or patch to major contributions in code, design, or marketing, we couldn’t have done it without you!

On behalf of the CouchDB PMC,
Jan Lehnardt
—

3.5.0

Dear community,

Apache CouchDB® 3.5.0 has been released and is available for download.

CouchDB 3.5.0 is a feature release, and was originally published on 2025-05-06.

https://couchdb.apache.org/#download

Pre-built packages for Windows, macOS, Debian/Ubuntu and RHEL/CentOS, as well as Docker images are available.

Release Notes highlights:

  – Support for truly parallel reads independent from writes. Enabled by default, can result in 10%-40% more throughput with highly concurrent workloads.

  – The config option `upgrade_hash_on_auth` and the use of xxHash have now been enabled by default. You can safely up-and-downgrade between CouchDB versions 3.4.x to 3.5.0. With these features enabled by default, you cannot upgrade and then revert from earlier versions of CouchDB. If you need to be able to downgrade, upgrade to CouchDB 3.4.x before upgrading to 3.5.0.

  – Introducing a conflict finder plugin to the scanner module. You can now scan your databases for conflicts in the background and have results reported in CouchDB logs for cleanup.

  – This release adds four new built-in reducers: `_top_N`, `_bottom_N`, `_first` and `_last` obviating the need to implement these yourself.

  – Official binary packages are now shipping with Erlang 26, resulting in better JIT performance across the board.

See the official release notes document for an exhaustive list of all changes:

    http://docs.couchdb.org/en/stable/whatsnew/3.5.html

Apache CouchDB® lets you access your data where you need it. The Couch Replication Protocol is implemented in a variety of projects and products that span every imaginable computing environment from globally distributed server-clusters, over mobile phones to web browsers.

Store your data safely, on your own servers, or with any leading cloud provider. Your web- and native applications love CouchDB, because it speaks JSON natively and supports binary data for all your data storage needs.

The Couch Replication Protocol lets your data flow seamlessly between server clusters to mobile phones and web browsers, enabling a compelling offline-first user-experience while maintaining high performance and strong reliability. CouchDB comes with a developer-friendly query language, and optionally MapReduce for simple, efficient, and comprehensive data retrieval.

The community would like to thank all contributors for their part in making this release, from the smallest bug report or patch to major contributions in code, design, or marketing, we couldn’t have done it without you!

On behalf of the CouchDB PMC,
Jan Lehnardt