Read Path Sequence

%% Runtime view — the read path: two-hop metadata resolution + k-of-n reconstruction %% Diagrams as code. Render with any Mermaid renderer. sequenceDiagram participant C as Client library participant N as Global namespace (L2) participant M as Metadata store (L4, home zone) participant D as D servers (home zone) C->>N: 1. Resolve path → file id + home zone (+ ACL) N-->>C: home zone (cached after first use) C->>M: 2. Fetch chunk map: fragments, locations, EC scheme M-->>C: chunk map (cached after first read) C->>D: 3. Read any k of n fragments (parallel) D-->>C: fragments (slowest n−k ignored) C->>C: 4. Verify checksums + reconstruct Note over C,N: Steady state — both metadata hops cached → straight to D servers Note over C,D: Consistency-sensitive reads route to the home zone; stale-tolerant may use a replica