Log Compaction

// TODO

API

GET /log/snapshot

Returns snapshot metadata. Before any snapshot is taken, both fields are 0.

GET /log/snapshot

----

200
{
  "last-included-index": 10,
  "last-included-term": 2
}

Rough Notes

• Prevent unbounded log growth
• Take snapshots of state machine (KV store)
• Truncate log after snapshot
• InstallSnapshot RPC for slow/catching-up followers
• Snapshot metadata (last included index, last included term)
• Incremental snapshots or full state dump
• When to snapshot (configurable: every N entries, every M seconds, size threshold)
• Note: snapshot size = data size problem (document limitation, point to storage engine solutions)