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For better managing and releasing code, here is a summary about the versioning story of ElasticDL. Some previous discussions can be found here.


There are three different type branches:

  • develop branch: the main branch where the source code always reflects a state with the latest delivered development changes for the next release.
  • feature branches: branch off from the develop branch and merge back into develop. Feature branches are used to develop new features, and created/maintained by developers themselves. Feature branches will be deleted after code changes get merge info develop branch.
  • release branches: branch off from the develop branch. When the develop branch reaches the desired state of a new release, cut off a new release branch, and start to publish new versions there. Release branches will be kept.

For version numbers, we follow the Semantic Versioning 2.0.0 with style MAJOR.MINOR.PATCH (e.g. 0.2.1). For each MAJOR.MINOR, we keep a corresponding release branch (named branch-x.y), and each following patch version x.y.z is released from it.

Feature Development

New features and bugfixes are developed in feature branches. Make sure you work with the latest version of develop branch.

# Start a new feature branch from develop branch

$ git checkout -b feature1 develop
# Do some code changes locally

$ git commit -a -m "Add some feature description"
$ git push origin feature1
# Create a PR for feature1 in

# Once the PR gets accepted and merged, it is ok to delete the branch locally

$ git checkout develop
$ git branch -D feature1

Here is the tutorial on how to open a pull request.


Here are detailed steps for releasing an example version 0.1.0.

# Update RELEASE to include the new changes and get merged in develop branch

# Then, start a new release branch from develop branch

$ git checkout -b branch-0.1 develop
$ git push origin branch-0.1
# Prepare the first release candidate version v0.1.0rc0

$ ./scripts/ v0.1.0rc0
# Then commit changes

$ git commit -a -m "Release v0.1.0rc0"
$ git push origin branch-0.1
# Publish v0.1.0rc0 to PyPI

# A detailed instruction is available at

So now we have v0.1.0rc0 ready to use. Test out this version. If any issues found, get them fixed in develop branch, merged into branch-0.1 branch, and repeat the aforementioned steps to publish a new release candidate version. We keep releasing rc version until no further issues found. At that time, release the official v0.1.0 version.

$ git checkout -b branch-0.1 develop
$ ./scripts/ v0.1.0
# Also remember to update RELEASE

$ git commit -a -m "Release v0.1.0"
$ git push origin branch-0.1
# Publish v0.1.0 to PyPI

# Also add a tag for this release

$ git tag v0.1.0 -a
$ git push origin v0.1.0

Note that for creating new releases and tags, you can also do from the website.

For cases where the release branch already exists (for example when releasing 0.1.1 and branch-0.1 is already there), just reuse that release branch and merge required commits from develop branch to the corresponding release branch.