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)
[debug] Cache key: Linux-npm-8c7a2b3d... [debug] Checking cache for key... [debug] Cache hit occurred on key: Linux-npm-8c7a2b3d... [debug] Restored cache size: 425 MB [debug] Save cache failure: cache size (2150 MB) exceeds limit of 2048 MB debug-action-cache
In modern Continuous Integration and Continuous Deployment (CI/CD) pipelines, speed is everything. Software engineering teams heavily rely on caching mechanisms to eliminate redundant steps like reinstalling vendor packages or recompiling static assets. However, when a cache breaks, developers face , corrupted dependencies , and ballooning build times . Debugging a cache requires understanding why it failed
to list and even delete problematic caches from your terminal. 4. Live Debugging on the Runner [debug] Checking cache for key