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fluidb-old/doc/DESIGN.md

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rqlite

You can find details on the design and implementation of rqlite from these blog posts.

rqlite was also discussed at the GoSF April 2016 Meetup. You can find the slides here.

Node design

The diagram below shows a high-level view of a rqlite node.

             ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐             ┌ ─ ─ ─ ─ ┐
                         Clients                            Other
             └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘             │  Nodes  │
                            │                             ─ ─ ─ ─ ─
                            │                                 ▲
                            │                                 │
                            │                                 │
                            ▼                                 ▼
             ┌─────────────────────────────┐ ┌─────────────────────────────────────┐
             │           HTTP(S)           │ │                  TCP                │
             └─────────────────────────────┘ └─────────────────────────────────────┘
             ┌───────────────────────────────────────────────┐┌────────────────────┐
             │             Raft (hashicorp/raft)             ││   Internode meta   │
             └───────────────────────────────────────────────┘└────────────────────┘
             ┌───────────────────────────────────────────────┐
             │               matt-n/go-sqlite3               │
             └───────────────────────────────────────────────┘
             ┌───────────────────────────────────────────────┐
             │                   sqlite3.c                   │
             └───────────────────────────────────────────────┘
             ┌───────────────────────────────────────────────┐
             │                 RAM or disk                   │
             └───────────────────────────────────────────────┘

Log Compaction

rqlite automatically performs log compaction. After a configurable number of changes rqlite snapshots the SQLite database, and truncates the Raft log. This is a technical feature of the Raft consensus system, and most users of rqlite need not be concerned with this.