pipeline {
    agent {
        label 'Docker'
    }
    options {
        disableConcurrentBuilds()
        buildDiscarder(logRotator(numToKeepStr: '1'))
        timestamps()
    }
    stages {
        stage('Non-Parallel Stage') {
            steps {
                echo 'This stage will be executed first.'
            }
        }
        stage('Parallel Stage') {
            failFast true
            parallel {
                stage('Branch A') {
                    agent {
                        label "Docker"
                    }
                    steps {
                        echo "On Branch A"
                        sh "/usr/bin/stress --cpu 4 --io 4 --vm 2 --vm-bytes 128M --timeout 300s"
                    }
                }
                stage('Branch B') {
                    agent {
                        label "Docker"
                    }
                    steps {
                        echo "On Branch B"
                        sh "/usr/bin/stress --cpu 4 --io 4 --vm 2 --vm-bytes 128M --timeout 300s"
                    }
                }
                stage('Branch C') {
                    agent {
                        label "Docker"
                    }
                    stages {
                        stage('Nested 1') {
                            steps {
                                echo "In stage Nested 1 within Branch C"
                                sh "/usr/bin/stress --cpu 4 --io 4 --vm 2 --vm-bytes 128M --timeout 300s"
                            }
                        }
                        stage('Nested 2') {
                            steps {
                                echo "In stage Nested 2 within Branch C"
                                sh "/usr/bin/stress --cpu 4 --io 4 --vm 2 --vm-bytes 128M --timeout 300s"
                            }
                        }
                    }
                }
                stage('Branch D') {
                    agent {
                        label "Docker"
                    }
                    stages {
                        stage('Nested 1') {
                            steps {
                                echo "In stage Nested 1 within Branch D"
                                sh "/usr/bin/stress --cpu 4 --io 4 --vm 2 --vm-bytes 128M --timeout 300s"
                            }
                        }
                        stage('Nested 2') {
                            steps {
                                echo "In stage Nested 2 within Branch D"
                                sh "/usr/bin/stress --cpu 4 --io 4 --vm 2 --vm-bytes 128M --timeout 300s"
                            }
                        }
                    }
                }
            }
        }
    }
    post {
        cleanup {
            echo 'One way or another, I have finished'
            deleteDir() /* cleanup our workspace */
        }
    }
}