Sometimes the cache hit is correct, but the files it points to are corrupted or missing from the CAS.
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Would you like a (e.g., caching pip , npm , gradle , or Docker layers) that includes all these debugging techniques? debug-action-cache
GitHub Actions relies heavily on the actions/cache utility. When a cache hit causes errors, use the following sequence to isolate and fix the problem. 1. Enable Step and System Diagnostics
At its core, the action uses a you provide to uniquely identify a cache. When you run a workflow, the action attempts to restore a cache by matching this key. If found, the cached files are downloaded to your specified path. For example, a typical configuration uses: Sometimes the cache hit is correct, but the
To maximize the benefits of debug-action-cache , follow these best practices:
What kind of report are you looking for? When a cache hit causes errors, use the
This comprehensive technical guide outlines the architecture of build caching, diagnoses common failure points, and provides step-by-step methodologies to inspect and debug your action cache across platforms like and advanced monorepo build tools like Bazel . The Architecture of an Action Cache
To fix these performance bottlenecks, teams frequently need to implement a dedicated troubleshooting workflow—often organized under automated diagnostics or pipelines named . 🚀 Understanding the Action Cache Ecosystem
This explains why a key isn’t matching.
to get system-level information about the runner environment. 2. Verify Your Cache Keys Cache misses often occur because the generated by hashFiles() doesn't match what was previously saved.