Upcoming Jenkins Office Hours: Acceptance Test Harness

One of the new efforts in Jenkins this year is the acceptance test harness for Jenkins.

We will be doing the Jenkins office hours next week to go over this and sync up and coordinate between people in the community that are trying to work on this.

It'll be April 23rd 11am PT (see what this time is in your time zone) on Google Hangout at http://jenkins-ci.org/hangout. If you are intereste in hacking Jenkins or if you are a large user of Jenkins who have acceptance tests, we are looking forward to seeing you there.

For those of you who haven't looked, this test harness allows you to write blackbox tests of Jenkins and its plugins. It was originally used to test LTS releases, but over the time, it acquired a number of features, such as ...:

  • Docker support for launching complex fixtures to test Jenkins with.
  • Pluggability to launch Jenkins under test (JUT) in many different environments

Jenkins 1.532.3 LTS is released

The final LTS release of the 1.532.x line is out today. You can download it from the usual location. Changelog is here.

Starting with the next 1.554.x LTS, the release model will switch to the train model, where we commit to dates and get whatever we can ship by that date.

You can see the scheduled dates in our event calendar. Backporting window for 1.554.1 is almost closing, so if you want to have your favorite issues nominated for it, please see the process in the Wiki and hurry!

InfoQ CI survey 2014

InfoQ has been running a CI server survey for more than a month now, and here is the current result:

Jenkins has gotten more than 70% of the votes, once again proving the wide adoption among developers. If you are one of those who picked Cruise Control into the "considering" section, I'd encourage you to look around a bit more.

You can still vote from their website or leave comments if you want.

By the way, the design of two axes make no sense to me; for example, I'd order the adoption axis to "considering -> migrating to -> using now -> moving away from", and the circle seems to imply two axes are somehow interchangeable, when it should probably be just in a checkerboard to indicate those are independent axes.

More scalable slaves


NIO-based Java Web Start (JNLP) slave handling is coming to 1.560. This will help you run a large number of JNLP slaves more efficiently. A connected JNLP slave used to occupy one thread on the master, but now it occupies none. Combined with the earlier change that eliminated threads from idle executors, now you can connect thousands of slaves.

All you have to do is to use the latest slave.jar from Jenkins 1.560. No other changes are necessary on users' part.

A bulk of this is implemented in remoting 2.38, and a good part of it was implemented about a year ago on the airplane on the way to Europe.

Maven job type performance improvements in Maven plugin 2.2

I recently had an opportunity to visit a big Jenkins user on site, and one of the things they've told me is that building projects in the Maven job type is substantially slower than doing the same with the freestyle project type.

This is partly expected, because this job type does more for you. For example, it automatically archives your build artifacts, fingerprints all the relevant information, and so on. These are good things, and naturally, it cost time.

But the slow down they are seeing was substantial, and this is a complaint I've heard from others as well. So I started looking into it.

With a help of artificial delay induced to my network interface and several custom scripts to probe into the running processes, I was able to understand what was going on and make some good improvements.