[JENKINS-39464] Pipeline with parallel and no stages does not get visualised correctly - Jenkins Jira

Type: Bug
Resolution: Fixed
Priority: Major
Component/s: blueocean-plugin
Labels:
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Problem
If you have a parallel declaration, but no stages, in classic stage view nothing shows up (you just have to look at log). In blue ocean, you get a single node (stage) which shows only the first branch.
Expected behavior: should show 3 parallel branches (ideally)

Example

parallel 'branch1': {
        node('node1') {
            stage('Setup') {
                checkout([details removed])
            }
            stage('Unit and Integration Tests') {
                bat '"my command to execute tests"'
            }
        }
}, 'branch2': {
        node('node2') {
            stage('Setup') {
                checkout([details removed])
            }
            stage('Unit and Integration Tests') {
                bat '"my command to execute tests"'
            }
        }
}

Workaround
Simply wrap the parallels in a stage and it will work correctly.

stage('Build and Test') {
  parallel 'branch1': {
          node('node1') {
              stage('Setup') {
                  checkout([details removed])
              }
              stage('Unit and Integration Tests') {
                  bat '"my command to execute tests"'
              }
          }
  }, 'branch2': {
          node('node2') {
              stage('Setup') {
                  checkout([details removed])
              }
              stage('Unit and Integration Tests') {
                  bat '"my command to execute tests"'
              }
          }
  }
}

It will then be visualised like:

Other examples

Parallel defined between stages but not nested in its own stage

node {
	stage('Checkout') {
		checkout scm
	}
}

parallel linux: {
	node('Linux') {
		stage('Build') {
			echo 'Build linux'
		}
		stage('Tests') {
			echo 'Tests linux'
		}
		stage('Static analysis') {
			echo 'Static analysis linux'
		}
	}
},
windows: {
	node('Windows') {
		stage('Build') {
			echo 'Build windows'
		}
		stage('Tests') {
			echo 'Tests windows'
		}
		stage('Static analysis') {
			echo 'Static analysis windows'
		}
	}
}