ConcurrentModificationException when too many jobs and the jobs finishing too fast

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Ukonn Ra

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Sep 21, 2020, 10:34:11 PM9/21/20
to job-dsl-plugin

I have a Jenkins pressure test to determine how many executors can be handled on my node:

// Jenkinsfile

int MAX_JOBS

static String jobTemplate(String name, int i) {    
    return """
job('$name') {
  steps {
    shell "/bin/bash /script/for/pressure/tests"
  }
}
"""
}

def parallelledStages(int maxJobs) {
    def stagesMap = [:]

    for (int i = 0; i < maxJobs; i ++) {
        def name = "test$i"

        def stageStep = {
            jobDsl scriptText: jobTemplate(name, i), sandbox: true
            build name
        }

        stagesMap[name] = stageStep
    }

    return stagesMap
}

pipeline {
    agent {
        label "pressure_test"
    }
    stages {
        stage("Init variables") {
            steps {
                script {
                    MAX_JOBS = 100
                }
            }
        }
        stage("Create and start jobs") {
            steps {
                script {
                    parallel parallelledStages(MAX_JOBS)
                }
            }
        }
    }
}


But in fact, when the pressure script finishs too fast (less than 30 seconds I think), some child jobs cannot start at all, and throws the following error:

Processing provided DSL script

java.util.ConcurrentModificationException

at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:719)

at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:742)

at java.util.AbstractCollection.addAll(AbstractCollection.java:343)

at java.util.TreeSet.addAll(TreeSet.java:312)

at java.util.TreeSet.<init>(TreeSet.java:160)

at javaposse.jobdsl.plugin.actions.GeneratedObjectsRunAction.getModifiedObjects(GeneratedObjectsRunAction.java:47)

at javaposse.jobdsl.plugin.ExecuteDslScripts.perform(ExecuteDslScripts.java:364)

at jenkins.tasks.SimpleBuildStep.perform(SimpleBuildStep.java:112)

at sun.reflect.GeneratedMethodAccessor462.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:92)

at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:70)

at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution.lambda$start$0(SynchronousNonBlockingStepExecution.java:47)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

at java.lang.Thread.run(Thread.java:748)

And the seed job will throw the error finally:

hudson.AbortException
at javaposse.jobdsl.plugin.ExecuteDslScripts.perform(ExecuteDslScripts.java:374)
at jenkins.tasks.SimpleBuildStep.perform(SimpleBuildStep.java:112)
Also:   hudson.AbortException
at javaposse.jobdsl.plugin.ExecuteDslScripts.perform(ExecuteDslScripts.java:374)
at jenkins.tasks.SimpleBuildStep.perform(SimpleBuildStep.java:112)
Caused: java.lang.reflect.InvocationTargetException
Also:   hudson.AbortException
at javaposse.jobdsl.plugin.ExecuteDslScripts.perform(ExecuteDslScripts.java:374)
at jenkins.tasks.SimpleBuildStep.perform(SimpleBuildStep.java:112)
Caused: java.lang.reflect.InvocationTargetException
Also:   hudson.AbortException
at javaposse.jobdsl.plugin.ExecuteDslScripts.perform(ExecuteDslScripts.java:374)
at jenkins.tasks.SimpleBuildStep.perform(SimpleBuildStep.java:112)
Caused: java.lang.reflect.InvocationTargetException
Caused: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor462.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:92)
at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:70)
at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution.lambda$start$0(SynchronousNonBlockingStepExecution.java:47)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Finished: FAILURE


So just wondering:

  1. Is there something wrong in the `parallel` operator? Maybe some HashMap should be locked?
  2. How can I deal with this issue?
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