rok opened a new pull request, #50047:
URL: https://github.com/apache/arrow/pull/50047
### Rationale for this change
C++ CI jobs currently key `ccache`/Docker volume caches with
`hashFiles('cpp/**')`. This creates new immutable GitHub Actions cache entries
whenever any C++ file changes, even though `ccache` already handles per-file
invalidation internally.
Recent CI logs show that when caches are restored, C++ jobs get high ccache
hit rates, but GitHub cache restore misses are common and cause large runtime
regressions.
### What changes are included in this PR?
* Replace `actions/cache` with explicit `actions/cache/restore` and
`actions/cache/save`.
* Remove `hashFiles('cpp/**')` from C++ cache keys.
* Use stable restore prefixes per job/config.
* Save updated caches only from `main`, using unique `github.run_id` keys.
### Are these changes tested?
By CI?
### Are there any user-facing changes?
CI users should see faster builds..
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