content-hash-cache-pattern

Caching file processing results by content hash involves computing a SHA-256 hash of the file content and using it as the cache key. This ensures cache validity even if files are renamed or moved, preventing redundant processing for identical content.

Path-based caches fail on rename or move because the path changes while content remains the same. Keying cache entries on SHA-256 content hash instead of file path solves this by matching identical content regardless of location.

Chunked hashing allows computing SHA-256 content hashes for large files without loading them entirely into memory. This generates deterministic cache keys for the cache service while keeping memory usage low during file processing.

Yes, integrating a content hash cache into PDF or OCR pipelines requires pure processing functions and a cache service managing JSON entries. This prevents redundant processing when identical file content is encountered repeatedly.

Yes, content hash caching supports CLI toggles like --cache and --no-cache. This allows enabling or disabling cache lookups for file processing pipelines directly from the command line during document extraction tasks.