》一文中介绍了如何在声明式 pipeline 中执行并行的任务。前一段时间，Jenkins 发布了 1.3 版的声明式 pipeline(declarative pipeline)，这个版本继续增强了并行执行任务的能力：并行执行的任务可以是个任务流。官方称这一功能为 "sequential stages"，本文将解释 "sequential stages"，并通过 demo 演示其用法。
》一文中介绍的方式，我们在一个 stage 中设置多个子 stage 并行执行：
stages {
stage(</span><span style="color: #800000">'</span><span style="color: #800000">Stage1</span><span style="color: #800000">'</span><span style="color: #000000">) {
agent { label </span><span style="color: #800000">"</span><span style="color: #800000">master</span><span style="color: #800000">"</span><span style="color: #000000"> }
steps {
timestamps {
</span><span style="color: #0000ff">echo</span> <span style="color: #800000">'</span><span style="color: #800000">这是第一个被执行的 stage.</span><span style="color: #800000">'</span>
<span style="color: #0000ff">sleep</span> <span style="color: #800080">5</span><span style="color: #000000">
}
}
}
stage(</span><span style="color: #800000">"</span><span style="color: #800000">build,deploy and test on Windows and Linux</span><span style="color: #800000">"</span><span style="color: #000000">) {
parallel {
stage(</span><span style="color: #800000">"</span><span style="color: #800000">windows</span><span style="color: #800000">"</span><span style="color: #000000">) {
agent {
label </span><span style="color: #800000">"</span><span style="color: #800000">master</span><span style="color: #800000">"</span><span style="color: #000000">
}
stages {
stage(</span><span style="color: #800000">"</span><span style="color: #800000">build</span><span style="color: #800000">"</span><span style="color: #000000">) {
steps {
timestamps {
</span><span style="color: #0000ff">echo</span> <span style="color: #800000">"</span><span style="color: #800000">build on windows.</span><span style="color: #800000">"</span><span style="color: #000000">
}
}
}
stage(</span><span style="color: #800000">"</span><span style="color: #800000">deploy</span><span style="color: #800000">"</span><span style="color: #000000">) {
steps {
timestamps {
</span><span style="color: #0000ff">echo</span> <span style="color: #800000">"</span><span style="color: #800000">deploy on windows.</span><span style="color: #800000">"</span><span style="color: #000000">
}
}
}
stage(</span><span style="color: #800000">"</span><span style="color: #800000">test</span><span style="color: #800000">"</span><span style="color: #000000">) {
steps {
timestamps {
</span><span style="color: #0000ff">echo</span> <span style="color: #800000">"</span><span style="color: #800000">test on windows.</span><span style="color: #800000">"</span>
<span style="color: #0000ff">sleep</span> <span style="color: #800080">5</span><span style="color: #000000">
}
}
}
}
}
stage(</span><span style="color: #800000">"</span><span style="color: #800000">linux</span><span style="color: #800000">"</span><span style="color: #000000">) {
agent {
label </span><span style="color: #800000">"</span><span style="color: #800000">worker1</span><span style="color: #800000">"</span><span style="color: #000000">
}
stages {
stage(</span><span style="color: #800000">"</span><span style="color: #800000">build</span><span style="color: #800000">"</span><span style="color: #000000">) {
steps {
timestamps {
</span><span style="color: #0000ff">echo</span> <span style="color: #800000">"</span><span style="color: #800000">build on linux.</span><span style="color: #800000">"</span><span style="color: #000000">
}
}
}
stage(</span><span style="color: #800000">"</span><span style="color: #800000">deploy</span><span style="color: #800000">"</span><span style="color: #000000">) {
steps {
timestamps {
</span><span style="color: #0000ff">echo</span> <span style="color: #800000">"</span><span style="color: #800000">deploy on linux.</span><span style="color: #800000">"</span><span style="color: #000000">
}
}
}
stage(</span><span style="color: #800000">"</span><span style="color: #800000">test</span><span style="color: #800000">"</span><span style="color: #000000">) {
steps {
timestamps {
</span><span style="color: #0000ff">echo</span> <span style="color: #800000">"</span><span style="color: #800000">test on linux.</span><span style="color: #800000">"</span>
<span style="color: #0000ff">sleep</span> <span style="color: #800080">5</span><span style="color: #000000">
}
}
}
}
}
}
}
stage(</span><span style="color: #800000">'</span><span style="color: #800000">Stage3</span><span style="color: #800000">'</span><span style="color: #000000">) {
agent { label </span><span style="color: #800000">"</span><span style="color: #800000">worker1</span><span style="color: #800000">"</span><span style="color: #000000"> }
steps {
timestamps {
</span><span style="color: #0000ff">echo</span> <span style="color: #800000">'</span><span style="color: #800000">这是最后一个被执行的 stage.</span><span style="color: #800000">'</span><span style="color: #000000">
}
}
}
}
}
》一文中进行了介绍。到今年(2018) 7 月份声明式 pipeline 发布了版本 1.3，这个版本中开始支持本文介绍的任务流级别的并行。至此笔者认为 jenkins 声明式 pipeline 中任务的并行执行功能已经比较完善了。
(declarative pipeline 1.3 的新功能)
