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251 lines
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=====================
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Development workflows
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=====================
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This page explains the workflows a developer is expected to follow to
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implement the goals that are part of the Ceph release cycle. It does not
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go into technical details and is designed to provide a high level view
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instead. Each chapter is about a given goal such as ``Merging bug
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fixes or features`` or ``Publishing point releases and backporting``.
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A key aspect of all workflows is that none of them blocks another. For
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instance, a bug fix can be backported and merged to a stable branch
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while the next point release is being published. For that specific
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example to work, a branch should be created to avoid any
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interference. In practice it is not necessary for Ceph because:
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* there are few people involved
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* the frequency of backports is not too high
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* the reviewers, who know a release is being published, are unlikely
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to merge anything that may cause issues
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This ad-hoc approach implies the workflows are changed on a regular
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basis to adapt. For instance, ``quality engineers`` were not involved
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in the workflow to publish ``dumpling`` point releases. The number of
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commits being backported to ``firefly`` made it impractical for developers
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tasked to write code or fix bugs to also run and verify the full suite
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of integration tests. Inserting ``quality engineers`` makes it
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possible for someone to participate in the workflow by analyzing test
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results.
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The workflows are not enforced when they impose an overhead that does
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not make sense. For instance, if the release notes for a point release
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were not written prior to checking all integration tests, they can be
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commited to the stable branch and the result sent for publication
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without going through another run of integration tests.
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Release Cycle
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=============
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::
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Ceph hammer infernalis
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Developer CDS CDS
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Summit | |
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development | |
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release | v0.88 v0.89 v0.90 ... | v9.0.0
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--v--^----^--v---^------^--v- ---v----^----^--- 2015
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stable giant | | hammer
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release v0.87 | | v0.94
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point firefly dumpling
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release v0.80.8 v0.67.12
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Four times a year, the development roadmap is discussed online during
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the `Ceph Developer Summit <http://tracker.ceph.com/projects/ceph/wiki/Planning#Ceph-Developer-Summit>`_. A
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new stable release (hammer, infernalis, jewel ...) is published at the same
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frequency. Every other release (firefly, hammer, jewel...) is a `Long Term
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Stable (LTS) <../../releases>`_. See `Understanding the release cycle
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<../../releases#understanding-the-release-cycle>`_ for more information.
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Merging bug fixes or features
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=============================
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The development branch is ``master`` and the workflow followed by all
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developers can be summarized as follows:
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* The developer prepares a series of commits
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* The developer submits the series of commits via a pull request
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* A reviewer is assigned the pull request
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* When the pull request looks good to the reviewer, it is merged into
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an integration branch by the tester
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* After a successful run of integration tests, the pull request is
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merged by the tester
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The ``developer`` is the author of a series of commits. The
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``reviewer`` is responsible for providing feedback to the developer on
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a regular basis and the developer is invited to ping the reviewer if
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nothing happened after a week. After the ``reviewer`` is satisfied
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with the pull request, (s)he passes it to the ``tester``. The
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``tester`` is responsible for running teuthology integration tests on
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the pull request. If nothing happens within a month the ``reviewer`` is
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invited to ping the ``tester``.
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Resolving bug reports and implementing features
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===============================================
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All bug reports and feature requests are in the `issue tracker
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<http://tracker.ceph.com>`_ and the workflow can be summarized as
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follows:
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* The reporter creates the issue with priority ``Normal``
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* A developer may pick the issue right away
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* During a bi-weekly bug scrub, the team goes over all new issue and
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assign them a priority
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* The bugs with higher priority are worked on first
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Each ``team`` is responsible for a project, managed by leads_.
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.. _leads: index#Leads
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The ``developer`` assigned to an issue is responsible for it. The
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status of an open issue can be:
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* ``New``: it is unclear if the issue needs work.
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* ``Verified``: the bug can be reproduced or showed up multiple times
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* ``In Progress``: the developer is working on it this week
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* ``Pending Backport``: the fix needs to be backported to the stable
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releases listed in the backport field
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For each ``Pending Backport`` issue, there exists at least one issue
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in the ``Backport`` tracker to record the work done to cherry pick the
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necessary commits from the master branch to the target stable branch.
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See `the backporter manual
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<http://tracker.ceph.com/projects/ceph-releases/wiki/HOWTO>`_ for more
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information.
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Running and interpreting teuthology integration tests
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=====================================================
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The :doc:`/dev/sepia` runs `teuthology
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<https://github.com/ceph/teuthology/>`_ integration tests `on a regular basis <http://tracker.ceph.com/projects/ceph-releases/wiki/HOWTO_monitor_the_automated_tests_AKA_nightlies#Automated-tests-AKA-nightlies>`_ and the
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results are posted on `pulpito <http://pulpito.ceph.com/>`_ and the
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`ceph-qa mailing list <https://ceph.com/irc/>`_.
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* The job failures are `analyzed by quality engineers and developers
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<http://tracker.ceph.com/projects/ceph-releases/wiki/HOWTO_monitor_the_automated_tests_AKA_nightlies#List-of-suites-and-watchers>`_
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* If the cause is environmental (e.g. network connectivity), an issue
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is created in the `sepia lab project
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<http://tracker.ceph.com/projects/lab/issues/new>`_
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* If the bug is known, a pulpito URL to the failed job is added to the issue
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* If the bug is new, an issue is created
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The ``quality engineer`` is either a developer or a member of the QE
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team. There is at least one integration test suite per project:
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* `rgw <https://github.com/ceph/ceph/tree/master/qa/suites/rgw>`_ suite
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* `CephFS <https://github.com/ceph/ceph/tree/master/qa/suites/fs>`_ suite
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* `rados <https://github.com/ceph/ceph/tree/master/qa/suites/rados>`_ suite
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* `rbd <https://github.com/ceph/ceph/tree/master/qa/suites/rbd>`_ suite
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and many others such as
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* `upgrade <https://github.com/ceph/ceph/tree/master/qa/suites/upgrade>`_ suites
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* `power-cyle <https://github.com/ceph/ceph/tree/master/qa/suites/powercycle>`_ suite
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* ...
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Preparing a new release
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=======================
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A release is prepared in a dedicated branch, different from the
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``master`` branch.
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* For a stable releases it is the branch matching the release code
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name (dumpling, firefly, etc.)
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* For a development release it is the ``next`` branch
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The workflow expected of all developers to stabilize the release
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candidate is the same as the normal development workflow with the
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following differences:
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* The pull requests must target the stable branch or next instead of
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master
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* The reviewer rejects pull requests that are not bug fixes
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* The ``Backport`` issues matching a teuthology test failure and set
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with priority ``Urgent`` must be fixed before the release
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Cutting a new stable release
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============================
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A new stable release can be cut when:
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* all ``Backport`` issues with priority ``Urgent`` are fixed
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* integration and upgrade tests run successfully
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Publishing a new stable release implies a risk of regression or
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discovering new bugs during the upgrade, no matter how carefully it is
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tested. The decision to cut a release must take this into account: it
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may not be wise to publish a stable release that only fixes a few
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minor bugs. For instance if only one commit has been backported to a
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stable release that is not a LTS, it is better to wait until there are
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more.
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When a stable release is to be retired, it may be safer to
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recommend an upgrade to the next LTS release instead of
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proposing a new point release to fix a problem. For instance, the
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``dumpling`` v0.67.11 release has bugs related to backfilling which have
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been fixed in ``firefly`` v0.80.x. A backport fixing these backfilling
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bugs has been tested in the draft point release ``dumpling`` v0.67.12 but
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they are large enough to introduce a risk of regression. As ``dumpling``
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is to be retired, users suffering from this bug can
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upgrade to ``firefly`` to fix it. Unless users manifest themselves and ask
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for ``dumpling`` v0.67.12, this draft release may never be published.
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* The ``Ceph lead`` decides a new stable release must be published
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* The ``release master`` gets approval from all leads
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* The ``release master`` writes and commits the release notes
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* The ``release master`` informs the ``quality engineer`` that the
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branch is ready for testing
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* The ``quality engineer`` runs additional integration tests
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* If the ``quality engineer`` discovers new bugs that require an
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``Urgent Backport``, the release goes back to being prepared, it
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was not ready after all
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* The ``quality engineer`` informs the ``publisher`` that the branch
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is ready for release
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* The ``publisher`` `creates the packages and sets the release tag
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<../release-process>`_
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The person responsible for each role is:
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* Sage Weil is the ``Ceph lead``
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* Sage Weil is the ``release master`` for major stable releases
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(``firefly`` 0.80, ``hammer`` 0.94 etc.)
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* Loic Dachary is the ``release master`` for stable point releases
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(``firefly`` 0.80.10, ``hammer`` 0.94.1 etc.)
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* Yuri Weinstein is the ``quality engineer``
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* Alfredo Deza is the ``publisher``
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Cutting a new development release
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=================================
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The publication workflow of a development release is the same as
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preparing a new release and cutting it, with the following
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differences:
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* The ``next`` branch is reset to the tip of ``master`` after
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publication
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* The ``quality engineer`` is not required to run additional tests,
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the ``release master`` directly informs the ``publisher`` that the
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release is ready to be published.
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Publishing point releases and backporting
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=========================================
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The publication workflow of the point releases is the same as
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preparing a new release and cutting it, with the following
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differences:
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* The ``backport`` field of each issue contains the code name of the
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stable release
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* There is exactly one issue in the ``Backport`` tracker for each
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stable release to which the issue is backported
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* All commits are cherry-picked with ``git cherry-pick -x`` to
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reference the original commit
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See `the backporter manual
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<http://tracker.ceph.com/projects/ceph-releases/wiki/HOWTO>`_ for more
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information.
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