Using Jenkins Pipeline Parallel Syntax for Parallel Tasks and Stages in Microservice Deployments

In a microservice project with many service modules, managing them becomes cumbersome; each module is a separate GitLab project linked to a Jenkins job, and manual selection for releases is inefficient.

A dedicated Jenkins project can be created to centralize management: it binds to a GitLab group, retrieves project information via the GitLab API, allows users to select services to release, and then triggers each selected service's pipeline in parallel.

Example of parallel tasks using the parallel syntax:

def tasks = [:]
// Define parallel task names and actions
tasks["build01"] = { sh "ls" }
tasks["build02"] = { sh "ls" }
// Run in parallel
parallel tasks

Parallel stages can also be defined to run tests on different platforms simultaneously, reducing overall test time. The failFast parameter can be used to control whether other tasks should abort when one fails.

pipeline {
    agent none
    stages {
        stage('Run Tests') {
            parallel {
                stage('Test On Windows') {
                    agent { label "windows" }
                    steps { bat "run-tests.bat" }
                    post { always { junit "**/TEST-*.xml" } }
                }
                stage('Test On Linux') {
                    agent { label "linux" }
                    steps { sh "run-tests.sh" }
                    post { always { junit "**/TEST-*.xml" } }
                }
            }
        }
    }
}

The master job implementation stores the names of projects to be released in a list, builds a map of parallel tasks, and uses the build step to trigger each service's pipeline. Errors are captured in a buildStatus map and reported in the build description.

def jobs = ["test2","demo-test-service"]
def parallelMap = [:]
def buildStatus = [:]

jobs.each { 
    println(it)
    parallelMap[it] = {
        try {
            build job: "${it}", parameters: [string(name: 'branchName', value: 'Dev')]
        } catch(e) {
            println("${it}  " + e)
            buildStatus[it] = e
        }
    }
}
parallel parallelMap

// Evaluate status
for (i in buildStatus.keySet()) {
    currentBuild.description = "构建信息"
    currentBuild.description += ("
项目名称->" + i + "错误信息：->" + buildStatus[i])
}

By using Jenkins pipeline's parallel capabilities, each module can be built and deployed concurrently, accelerating release cycles and reducing repetitive manual operations.