|Dumpling LTS||Emperor Stable||Firefly LTS||Giant Stable||Hammer LTS||Infernalis Stable||Jewel LTS||Kraken Stable|
|First release||August 2013||November 2013||May 2014||October 2014||April 2015||November 2015||April 2016||January 2017|
|Estimated retirement||March 2015||January 2016||May 2017||November 2017|
|Actual retirement||May 2015||May 2014||April 2016||April 2015||April 2016|
|Development Testing||Dumpling LTS||Emperor Stable||Firefly LTS||Giant Stable||Hammer LTS||Infernalis Stable||Jewel LTS||Kraken Stable|
The development release cycle is two to four weeks long. Each cycle freezes the master development branch and applies integration and upgrade tests for the duration of one cycle before it is released and the next release’s code is frozen for testing. Once released, there is no effort to backport fixes; developer focus in on the next development release which is usually only a few weeks away.
There are three to four stable releases a year. Each stable release will receive a name (e.g., ‘Jewel’) and bug fix backports at least until the next stable release is out.
Every other stable releases is a LTS (Long Term Stable) and will receive updates until two LTS are published. For instance Dumpling is retired when Hammer is published, Firefly is retired when Jewel is published etc. The rationale is that backports to a LTS (Firefly for instance) are expected to happen until the next LTS is published (Jewel is the LTS following Hammer), to fix bugs and possibly backport important features. After the next LTS is published, backports are still expected to fix bugs with a focus on whatever can prevent upgrades to the next LTS (in our example, fixes to Dumpling were published after Firefly was released and until Hammer was published, primarily to ensure Dumpling cluster can smoothly migrate to Firefly).
For each stable release:
In the timeline, the life time of a LTS is calculated to be approximately 18 months after the month of the first release. For instance, Dumpling is published August 2013 and 18 months starting September 2013 is February 2015, therefore by March 2015 Dumpling should be retired. The lifetime of a release may vary because it depend on how quickly the stable releases are published. For instance although Dumpling theoritical retirement was March 2015, it was extended to May 2015.
The first Ceph release back in Jan of 2008 was 0.1. That made sense at the time. The versioning scheme did not change until April 2015, when 0.94.1 (the first Hammer point release) was published. To avoid reaching 0.99 (and 0.100 or 1.00?) we have a new strategy.
x will start at 9 for Infernalis (I is the 9th letter), making our first development release of the 9th release cycle 9.0.0. Subsequent development releases will be 9.0.1, 9.0.2, etc.
After a couple months we’ll have a 9.1.0 (and maybe 9.1.1) release candidate.
A few weeks after that we’ll have the Infernalis release 9.2.0, followed by stable bug fix updates 9.2.1, 9.2.2, etc., and then begin work on the Jewel (10.y.z) release.