Jenkins parameterized job that only queues one build

Question

Imagine a Jenkins job A which takes 1 minute to run, and job B which takes 5 minutes.

If we configure job A to trigger job B, while job B is running job A may run 5

Answer 1

Add a "System Groovy Script" pre-build step to job B that checks for (newer) queued jobs of the same name, and bails out if found:

def name = build.properties.environment.JOB_NAME
def queue = jenkins.model.Jenkins.getInstance().getQueue().getItems()
if (queue.any{ it.task.getName() == name }) {
  println "Newer " + name + " job(s) in queue, aborting"
  build.doStop()
} else {
  println "No newer " + name + " job(s) in queue, proceeding"
}