rok opened a new issue, #50046:
URL: https://github.com/apache/arrow/issues/50046
### Describe the enhancement requested
Our C++ GitHub Actions jobs currently use `ccache` through `actions/cache`.
Many cache keys include the full C++ source tree hash, for example:
```yaml
key: cpp-ccache-macos-${{ matrix.macos-version }}-${{ hashFiles('cpp/**') }}
restore-keys: cpp-ccache-macos-${{ matrix.macos-version }}-
```
This was originally introduced in #7081 as a workaround for GitHub Actions
cache immutability: cache entries cannot be updated once written, so changing
keys are needed to create new cache snapshots.
However, using hashFiles('cpp/**') might be suboptimal for compiler caches.
Hashing the entire source tree at the outer GitHub cache layer creates many
distinct cache entries and increases the chance of cache misses/eviction.
### Component(s)
Continuous Integration
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