[yew1eb]

What changes were proposed in this pull request?

Each job in maven.yml re-downloads the Maven distribution from archive.apache.org via build/mvn (~25s typical, 1m49s observed on a slow network), even though ~/.m2 is already cached by setup-java. This PR adds an actions/cache@v4 step for the extracted Maven install under build/, so build/mvn reuses the cached binary — its install_app already skips the download when apache-maven-<version>/bin/mvn exists.

This mirrors the sbt launcher caching added for sbt.yml in CELEBORN-2432.

Why are the changes needed?

Save ~25s–2min per job; ~10–40 minutes of total machine time per CI run.

Does this PR resolve a correctness bug?

• Yes

Does this PR introduce any user-facing change?

• No

How was this patch tested?

Verified locally that build/mvn skips the download when build/apache-maven-<version>/bin/mvn is present. CI on this branch shows the cache step restoring and no curl download of the Maven tarball.

[Copilot]

Warning

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Copilot review overview

3 open issues

• The cache key is tied to pom.xml, which will invalidate the Maven binary cache whenever… · New
• The cache key doesn’t include OS/arch context (e.g., ${{ runner.os }} / ${{ runner.arch }}). If… · New
• The same cache step is duplicated across multiple jobs. To reduce the chance of future drift (e.g.,… · New

What changed in this PR

Adds GitHub Actions cache entries for the downloaded/extracted Maven distribution so CI jobs can reuse build/apache-maven-* instead of re-downloading Maven each run.

Changes:

• Add actions/cache@v4 step to cache build/apache-maven-* in each Maven CI job
• Use a shared cache key prefix (maven-distribution-) with a pom.xml hash-based key and restore keys

File	Description
.github/​workflows/​maven.yml	Adds caching for the extracted Maven distribution under build/ to speed up CI runs

_{Review effort: Lite}

[yew1eb]

Thanks for the review! Addressed in 0e286a6:

• OS/arch in key: added runner.os to both the cache key and the restore key prefix, so the cache can never be reused across runner platforms.
• pom.xml as the key source: kept intentionally — pom.xml is where <maven.version> is defined and where build/mvn reads it from, so a Maven version bump invalidates the exact key. Unrelated pom changes fall back to the restore key prefix, and since the restored cache already contains build/apache-maven-<version>/, build/mvn skips the download, so there is no re-download cost.
• Duplication across jobs: kept the steps inlined for readability; happy to factor them into a composite action as a follow-up if reviewers prefer.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.59%. Comparing base (90954f7) to head (0e286a6).
⚠️ Report is 61 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3880      +/-   ##
============================================
+ Coverage     58.74%   60.59%   +1.85%     
- Complexity      231      324      +93     
============================================
  Files           399      401       +2     
  Lines         28058    28415     +357     
  Branches       2740     2793      +53     
============================================
+ Hits          16479    17214     +735     
+ Misses        10380     9886     -494     
- Partials       1199     1315     +116     

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[zaynt4606]

LGTM

[zaynt4606]

Merge Summary:

• merged into main 60a90e57

Posted by merge_pr.py

[zaynt4606]

Thanks @yew1eb for the contribution!
Merged to main(v1.0.0).