node {
    
    stage('test' ) {
        println('pre parallel step')
    }
    
    
    stage('parallel stage') { 
        
        def array = ["a_1"]
    
        def builds = [:]
    
        array.each {
        
            test = it
            builds[it] = {
                
                node {
                    stage (it) {
                        println(it)   
                        sh 'date'
                    }
                }
            }
            
            
        }
        parallel builds
    
    }    
    
    stage('test2') {
        println('post parallel step')
    }