Maven Tests workflow (google/differential-privacy)

The Maven Tests workflow from google/differential-privacy, explained and optimized by Latchkey.

CI health: C - fair

Point runs-on at Latchkey and get caching, run de-duplication, self-healing for flaky steps, and up to 58% lower cost, applied automatically.

Grade your own workflow free or run it on Latchkey →

Source: google/differential-privacy.github/workflows/maven.ymlLicense Apache-2.0View source

What it does

This is the Maven Tests workflow from the google/differential-privacy repository, a real project running GitHub Actions. It is shown here with attribution under its Apache-2.0 license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)

name: Maven Tests

on: [push, pull_request, workflow_dispatch]

jobs:
  pipelinedp4j-tests:
    name: PipelineDP4J Maven Tests
    runs-on: ubuntu-latest
    timeout-minutes: 60
    steps:
      - uses: actions/checkout@v6
      - name: Cache Maven dependencies
        uses: actions/cache@v5
        with:
          path: ~/.m2/repository
          key: ${{ runner.os }}-maven-${{ hashFiles('examples/pipelinedp4j/pom.xml', 'examples/pipelinedp4j/**/pom.xml') }}
          restore-keys: |
            ${{ runner.os }}-maven-
      - name: Set up JDK 11
        uses: actions/setup-java@v5
        with:
          java-version: '11'
          distribution: 'temurin'
      - name: Install Maven
        run: sudo apt-get install -y maven
      - name: Create dummy input file for examples
        working-directory: examples/pipelinedp4j
        run: |
          cat << EOF > input.csv
          4505,573364,5,2004-13-29
          4501,2532865,4,2005-11-06
          4501,573364,2,2005-02-25
          4500,2532865,2,2004-12-12
          4505,1265574,4,2003-05-05
          4505,2532865,1,2004-12-12
          EOF
      - name: Install common package for examples
        working-directory: examples/pipelinedp4j
        run: mvn install
      - name: Run Beam Example
        working-directory: examples/pipelinedp4j/beam
        run: mvn compile exec:java -Dexec.mainClass=com.google.privacy.differentialprivacy.pipelinedp4j.examples.BeamExample -Dexec.args="--inputFilePath=$(pwd)/../input.csv --outputFilePath=output.txt"
      - name: Run Spark Example
        working-directory: examples/pipelinedp4j/spark
        run: mvn compile exec:java -Dexec.mainClass=com.google.privacy.differentialprivacy.pipelinedp4j.examples.SparkExample -Dexec.args="--inputFilePath=$(pwd)/../input.csv --outputFolder=output"
      - name: Run Spark DataFrame Example
        working-directory: examples/pipelinedp4j/spark
        run: mvn compile exec:java -Dexec.mainClass=com.google.privacy.differentialprivacy.pipelinedp4j.examples.SparkDataFrameExample -Dexec.args="--inputFilePath=$(pwd)/../input.csv --outputFolder=output"

The same workflow, on Latchkey

Estimated ~20% faster on cache hits, plus fewer wasted runs and a safer supply chain. Added and changed lines are highlighted.

name: Maven Tests
 
on: [push, pull_request, workflow_dispatch]
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  pipelinedp4j-tests:
    name: PipelineDP4J Maven Tests
    runs-on: latchkey-small
    timeout-minutes: 60
    steps:
      - uses: actions/checkout@v6
      - name: Cache Maven dependencies
        uses: actions/cache@v5
        with:
          path: ~/.m2/repository
          key: ${{ runner.os }}-maven-${{ hashFiles('examples/pipelinedp4j/pom.xml', 'examples/pipelinedp4j/**/pom.xml') }}
          restore-keys: |
            ${{ runner.os }}-maven-
      - name: Set up JDK 11
        uses: actions/setup-java@v5
        with:
          cache: 'maven'
          java-version: '11'
          distribution: 'temurin'
      - name: Install Maven
        run: sudo apt-get install -y maven
      - name: Create dummy input file for examples
        working-directory: examples/pipelinedp4j
        run: |
          cat << EOF > input.csv
          4505,573364,5,2004-13-29
          4501,2532865,4,2005-11-06
          4501,573364,2,2005-02-25
          4500,2532865,2,2004-12-12
          4505,1265574,4,2003-05-05
          4505,2532865,1,2004-12-12
          EOF
      - name: Install common package for examples
        working-directory: examples/pipelinedp4j
        run: mvn install
      - name: Run Beam Example
        working-directory: examples/pipelinedp4j/beam
        run: mvn compile exec:java -Dexec.mainClass=com.google.privacy.differentialprivacy.pipelinedp4j.examples.BeamExample -Dexec.args="--inputFilePath=$(pwd)/../input.csv --outputFilePath=output.txt"
      - name: Run Spark Example
        working-directory: examples/pipelinedp4j/spark
        run: mvn compile exec:java -Dexec.mainClass=com.google.privacy.differentialprivacy.pipelinedp4j.examples.SparkExample -Dexec.args="--inputFilePath=$(pwd)/../input.csv --outputFolder=output"
      - name: Run Spark DataFrame Example
        working-directory: examples/pipelinedp4j/spark
        run: mvn compile exec:java -Dexec.mainClass=com.google.privacy.differentialprivacy.pipelinedp4j.examples.SparkDataFrameExample -Dexec.args="--inputFilePath=$(pwd)/../input.csv --outputFolder=output"

What changed

Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
Cancel superseded runs when a branch or PR gets a newer push.
Cache dependency installs on the setup step so they are served from cache.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

Dependency installs

This workflow runs 1 job per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout actions/cache actions/setup-java