Distributed Password Manager

Project · cloud systems · CMPT 756

A GFS-style password vault on GCP that keeps serving reads when a replica dies, and replays what it missed when it returns.

• 741.9 ms avg read
• 1,168.7 ms avg write
• 46.7 s replica recovery
• 5 / 5 reads + writes with a replica down

• Context SFU CMPT 756 · coursework
• Deploy GCP · 1 master + 3 chunk servers across zones
• Transport Go · TLS 1.3
• Recovery WAL replay

Metadata apart from data

A master issues sequence numbers and coordinates; chunk servers hold replicated vault data. Primary replication keeps writes ordered across replicas.

Route around the dead, catch up the returning

Heartbeats with a 6-second timeout route reads away from failed replicas. A restarted replica replays the operations it missed from the master’s write-ahead log.