pipeline {
    agent any
    options {
        parallelsAlwaysFailFast()
    }
    stages {
        stage('Parallel Stage One') {
            // failFast true
            parallel {
                stage('Stage A') { }
                stage('Stage B') { }
                stage('Stage C') { }
            }
        }
        stage('Parallel Stage Two') {
            // failFast true
            parallel {
                stage('Stage D') { }
                stage('Stage E') { }
                stage('Stage F') { }
            }
        }
        stage('Parallel Stage Three') {
            // failFast true
            parallel {
                stage('Stage G') { }
                stage('Stage H') { }
                stage('Stage I') { }
            }
        }
    }
}