Debug-action-cache [2021] <4K — 360p>

If the log says "Cache restored from key...", the action did its job, but the data inside might be stale. Cache Miss: If it says "Cache not found for input keys," it means your

Debugging a cache requires understanding why it failed. GitHub Actions caches are immutable; once a cache is written to a specific key, it cannot be updated. Here are the most common root causes of cache issues: Issue A: The Cache Miss (False Negatives)

Use a diff tool (like meld , diff , or VS Code's built-in comparison) to look at the action inputs. debug-action-cache

No specific math was used. If I had to pick a formula that relates, it could be: $$time节省 = cache命中率 \times 调试动作时间$$

[debug] Download speed: 45.2 MB/s [debug] Parallel chunks: 4 [debug] Validation: SHA256 matches expected If the log says "Cache restored from key

Before digging into specific keys, you need to see exactly what the runner is doing during the "Restore Cache" and "Post-run: Save Cache" steps. Repository Variable Settings > Secrets and variables > Actions ACTIONS_STEP_DEBUG Workflow Scope : This will force the actions/cache

In the modern world of DevOps and Continuous Integration (CI), speed is a currency. Every minute saved in a build pipeline translates directly to faster feedback loops, reduced compute costs, and higher developer productivity. At the heart of this speed lies caching. However, when caching goes wrong, it creates a nightmare scenario: failed builds, stale dependencies, or the infamous "works on my machine" syndrome amplified across your CI/CD pipeline. Here are the most common root causes of

Let's map error symptoms to debug-action-cache insights.

If a cache download hangs due to a network glitch, ensure your job fails fast or skips the cache rather than wasting hours of billable CI time. Conclusion

For a more thorough investigation, you can bypass the workflow logs entirely and query the GitHub Cache API directly. The endpoint GET /repos/owner/repo/actions/caches returns a list of all caches for your repository, including their id , key , version , scope , created_at , and last_accessed_at timestamps.

you are caching exactly where the package manager installs files? Audit Permissions: Does the Action have write access to the cache storage? Isolate the Branch: Remember that caches are scoped; a cache created on might not be accessible to depending on your privacy settings. sample YAML configuration