Status: Resolved (View Workflow)
In a cloud-enabled environment where Hudson has zero static executors, there will be no Computer object until a node is provisioned, so even a fly-weight job would wait for an allocation of a node.
(And IIRC, I also saw that the flyweight job still used up a regular executor.)
Needs more analysis.
- is related to
JENKINS-17276 Downward configuration of executor count on master delayed in effect
Code changed in jenkins
User: Kohsuke Kawaguchi
[FIXED JENKINS-7291] Permit flyweight tasks to run on master even when it has zero configured executors.
Always adding Computer for master as a fallback
The original proposed fix for
JENKINS-7291 creates a Computer object
transitively. This seems unwise as it violates the design of Computer
as stated in the javadoc, and for example we can end up creating two
Computers for the master.
I think a better fix is to create a Computer for the master all the
time, even if there's no executors configured. The discrimination in
Queue.makeBuildable would ensure that such phantom Computer is only used
as a last resort (statistically speaking).
I've also tweaked executors.jelly a bit. I simplified it somewhat
based on the idea that "if there's only one computer to show, the
context is likely making it obvious".
(I must be missing the intricacy in the current code.)
Originally developed in a branch at
2c5b57fcc1f39ed39057254e802f4183db5aa0dc then squashed for clarity.
(cherry picked from commit a114c693bc61c564232e78c9fffb5de1ef946ea8)
@recampbell: you backported https://github.com/jenkinsci/jenkins/commit/a114c693bc61c564232e78c9fffb5de1ef946ea8, or are testing a 1.510+ build with the original fix, and still see the issue?
And did you verify that it is the matrix run which waits for, and runs on, the cloud slave instead of master, as opposed to the matrix configuration run which naturally has to run on the cloud slave? (Does testFlyweightTasksWithoutMasterExecutors pass?)
This doesn't resolve the issue for me. I see the master computer, but it is not used for the main matrix job. Instead, a cloud slave is provisioned. Steps to repro:
1. Create a matrix job with a single configuration, no labels
2. Ensure that Jenkins.numExecutors = 0
3. Ensure that a cloud plugin can provision slaves
4. Run the matrix job
The matrix job won't run on the master, but will result in a slave being provisioned.
Code changed in jenkins
User: Jesse Glick
JENKINS-7291Accidental Java 7 dependency in test.
(cherry picked from commit cedf17e00e1dc60ac4c8f0561e7975b146c9ffd8)