Publishing Releases

This document describes the Apache release process. Every Apache Software Foundation release must meet requirements for content , process , and publication. These requirements ensure that Apache contributors and users benefit from appropriate legal protection, and reflect the Foundation's goals of open, collaborative software development.

Intended Audience

Read this document if you are an Apache committer and you want to learn how to create and publish a release from an Apache project, or you have a general interest in the Apache release process. This document will provide you with an overview of tthe requirements and some commonly-used tools, and it will provide you with links to other pages with more details.

The Goal of the Release Process — or — What is an Apache Release, Anyway?

An Apache release is a set of valid , signed , artifacts, voted on by the appropriate PMC and distributed on the ASF's official release infrastructure. All of the highlighted words in the previous sentence are critical, and are defined in the following sections.

To write the process on a grain of rice, an Apache project: complies with the software licensing requirements , decides to make a release, and designates a release manager. The release manager prepares and signs the proposed release materials, and offers them up for a binding vote by the PMC. If the vote passes, the release manager copies the artifacts to the distribution infrastructure.

Who Manages The Release Process?

The common practice at Apache is for a single individual to take responsibility for the mechanics of a release. That individual is called the 'release manager.' Release managers take care of shepherding a release from an initial community consensus to make it to final distribution.

Release managers do the work of pushing out releases. However, release managers are not ultimately responsible. The PMC in general, and the PMC chair in particular (as an officer of the Foundation) is responsible for compliance with requirements.

Any committer may serve as the manager of a release.

A release starts when the project community agrees to make a release. However, no release manager can make a valid release unless the community has taken the necessary steps to prepare in advance. The source code and build process must comply with the legal and intellectual property requirements for a valid release, and the project must have the infrastructure in place to correctly sign the release artifacts.

What is a Valid Release Package?

The Apache Software Foundation exists to create open source software. Thus, the fundamental requirement for a release is that it consist of the necessary source code to build the project. Optionally, a release may be accompanied by compiled binaries for the convenience of users.

All the source code of the project must be covered by the Apache License, version 2.0. The license must be included in each source file. For the license to be valid, the code must have been contributed by an individual covered by an appropriate contributor license agreement, or have otherwise been licensed to the Foundation and passed through IP clearance. See this page for details on licensing and this FAQ for details on release requirements. When in doubt, contact the Foundation's Legal resources by filing a JIRA under the 'LEGAL' project. The RAT tool can assist in checking for compliance.

Many projects have dependencies on non-Apache components. For an Apache release to be valid, it may only depend on non-Apache components that have compatible licenses. For more information on third party license, see ASF Legal Previously Asked Questions.

Signing release artifacts

The files that make up an Apache release are always accompanied by cryptographic signatures. This allows users to ensure that the files have not been tampered with. The mechanics of signing depend on the project's build technology. The Apache infrastructure group strongly recommends that projects set up automated infrastructure to sign the files, as otherwise the process is painful. Generally, projects set up their build system so that the same process that creates the files for a release also signs them.

The process of setting up to sign the code is somewhat complicated, and it is described on the release signing page. If you plan to serve as a release manager, you should generate a key and publish it well in advance of creating a release.

Voting to Release

A binding vote of the PMC is the critical gating step in the release process. Without such a vote, the release is just a set of files prepared by an individual. After such a vote, it is a formal offering of the ASF, backed by the 'full faith and credit' of the Foundation. For more information on the voting process, see the voting policy.


The Apache infrastructure must be the primary source for all artifacts officially released by the ASF.

The Apache Infrastructure team maintains the Apache release distribution infrastructure. This infrastructure has two parts: the mirrored directories on and the Maven repository on

Each Apache TLP has a release/TLP-name directory in the distribution Subversion repository at Once a release vote passes, the release manager should svn add the artifacts (plus signature and hash files) into this location. Each project is responsible for the structure of its directory. The contents of these directories are pushed to by svnpubsub. Note that only the most recent version of each supported release line should be stored here; see when to archive.

The contents of the dist/release/ directories are published to the 3rd party mirrors using rsync.

It is vital that hash, signature and KEYS files are only downloaded from ASF hosts. So the following files are excluded from synchronisation:

.md5 .MD5 .sha1 .sha .sha256 .sha512 .asc .sig KEYS KEYS.txt MD5SUM SHA*SUM

MD5SUM and SHA*SUM must look like the output of md5sum(1): lines containing a checksum, followed by a filename ; use only plain filenames (no slashes).

Do not use any other file names for such files.

If the directory does not yet exist, please raise a JIRA for INFRA with the required info as per Providing needed information

Maven Distribution

See the Publishing Maven Releases guide.

I've Just Published A Release: Why Isn't It Available From XYZ?

Apache uses svnpubsub internally and rsync mirrroring externally. Files committed to the Subversion repository at are automatically copied, using svnpubsub, to , and then the external mirrors pick up the files from It may take up to 24 hours or more for a newly published release to be sync'd to all mirrors. Mirrors have their own schedules. Mirrors are required to check at least once a day, but most will check for updates 2 to 4 times per day.

How Can I Archive An Old Release?

See here and here.