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  1. Jenkins
  2. JENKINS-55426

Using "for in" loop for generating tasks for "parallel" execution, causes all tasks to have last value from iterated collection

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      Description

      When I try to generate tasks for parallel execution using the following code:

      import jenkins.model.Jenkins
      
      pipeline {
          agent none
          stages {
              stage('Preparing machines') {
                  steps {
                      script {
                          def machines = ['agent-windows0', 'agent-windows1', 'agent-redhat0', 'agent-redhat1']
                          def machinePreparations = [:]
      
                          for (machine in machines) {
                              def labelParameters = []
                              labelParameters.add([$class: 'NodeParameterValue', name: 'node_name', labels: [machine], nodeEligibility: [$class: 'AllNodeEligibility']])
                              labelParameters.add([$class: 'StringParameterValue', name: 'ARBITRARY_PARAMETER', value: 'ARBITRARY_VALUE'])
      
                              machinePreparations[machine] = {
                                  stage(machine + ' preparation') {
                                      build job: '../Preparation/' + machine, parameters: labelParameters
      
                                      def node = Jenkins.get().nodes.find({it.name == machine})
                                      node.setLabelString(node.getLabelString() + 'successful')
                                      println(String.format("Job with machine %s successfully done!", machine))
                                  }
                              }
                          }
      
                          parallel machinePreparations
                      }
                  }
              }
          }
      }
      

      I have all the tasks receiving last value from collection ("agent-redhat1") - see screen attached.
      This can be partially fixed by saving "machine" variable into another intermediate variable and using this intermediate variable instead:

      import jenkins.model.Jenkins
      
      pipeline {
          agent none
          stages {
              stage('Preparing machines') {
                  steps {
                      script {
                          def machines = ['agent-windows0', 'agent-windows1', 'agent-redhat0', 'agent-redhat1']
                          def machinePreparations = [:]
      
                          for (machine in machines) {
                              def agentName = machine
                              def labelParameters = []
                              labelParameters.add([$class: 'NodeParameterValue', name: 'node_name', labels: [agentName], nodeEligibility: [$class: 'AllNodeEligibility']])
                              labelParameters.add([$class: 'StringParameterValue', name: 'ARBITRARY_PARAMETER', value: 'ARBITRARY_VALUE'])
      
                              machinePreparations[agentName] = {
                                  stage(agentName + ' preparation') {
                                      build job: '../Preparation/' + agentName, parameters: labelParameters
      
                                      def node = Jenkins.get().nodes.find({it.name == agentName})
                                      node.setLabelString(node.getLabelString() + 'successful')
                                      println(String.format("Job with machine %s successfully done!", agentName))
                                  }
                              }
                          }
      
                          parallel machinePreparations
                      }
                  }
              }
          }
      }
      

      However, this also not fixing problem entirely, see JENKINS-55425

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              Assignee:
              vjuranek vjuranek
              Reporter:
              alpanshin Alexandr Panshin
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                Dates

                Created:
                Updated: