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BlobsFile status    Godoc Reference

BlobsFile is an append-only (i.e. no update and no delete) content-addressed blob store (using BLAKE2b as hash function).

It draws inspiration from Facebook's Haystack, blobs are stored in flat files (called BlobFile) and indexed by a small kv database for fast lookup.

BlobsFile is BlobStash's storage engine.


  • Durable (data is fsynced before returning)
  • Immutable (append-only, can't mutate or delete blobs)
  • Optional compression (Snappy or Zstandard)
  • Extra parity data is added to each BlobFile (using Reed-Solomon error correcting code), allowing the database to repair itself in case of corruption.
    • The test suite is literraly punching holes at random places