Run Jenkins Pipelines jobs in parallel from closure - jenkins

Question

I have a Jenkins server using the Pipeline plugin. In this, I want to launch several builds in parallel, and wait for the builds to complete before moving on to the next stage of my pipeline.
I am able to do this successfully, if I write out the build jobs explicitly, like so:
parallel 'one': {
build job: 'job1',
parameters: [
[$class: 'StringParameterValue', name: 'CONFIG', value: "foo"]
],
propagate: false,
wait: true
}, 'two': {
build job: 'job2',
parameters: [
[$class: 'StringParameterValue', name: 'CONFIG', value: "foo"]
],
propagate: false,
wait: true
}, 'three': {
build job: 'job3',
parameters: [
[$class: 'StringParameterValue', name: 'CONFIG', value: "foo"]
],
propagate: false,
wait: true
}
However, in reality, there will be a variable number of jobs that need to be built, so explicitly writing these out is not feasible. I have tried to wrap the builds in a closure like so:
def createParallel = { String parallelName ->
parallelName: {
build job: 'jobX',
parameters: [
[$class: 'StringParameterValue', name: 'CONFIG', value: "foo"]
],
propagate: false,
wait: true
}
}
parallel (
createParallel('one'),
createParallel('two'),
createParallel('three')
)
The problem with this method is the builds do not actually kick off in parallel - They build one at a time, waiting for the previous build to complete. What am I doing wrong?

Answer 1

You are not specifying any build parameters, so Jenkins coalesces the queue items, by design.

Answer 2

Set wait: false and build never wait for another build.But if you need to trigger another stage ,you have to get the result

Answer 3

The short answer is that presently this cannot be done in Jenkins, due to bugs JENKINS-33051 and JENKINS-25979.
What I was doing with the above was essentially creating three parallels, each with a single parameter. What needs to be done is place the closures in a list, and then spread the list as parameters, like so:
def list = [ createParallel('one'), createParallel('two'), createParallel('three') ]
parallel (*list)
Unfortunately, this is not implemented in Jenkins right now.