ExDataSketch.Storage (ExDataSketch v0.9.0)

Persistence backends for ExDataSketch sketches.

This module defines the shared behaviour and types for all persistence backends. Each backend implements a consistent storage contract:

save/3 -- persist a sketch under a key
load/3 -- retrieve and deserialize a sketch by key
merge/3 -- atomically merge a sketch into the persisted value
delete/2 -- remove a sketch by key

All backends serialize sketches using ExDataSketch.Binary.encode/3 and sketch_module.serialize/1 / sketch_module.deserialize/1. No backend stores raw sketch state; every stored value is a complete EXSK v2 frame with CRC32C checksum.

Available Backends

Backend	Module	Distribution	Durability
ETS	`ExDataSketch.Storage.ETS`	Per-node	Process lifetime
DETS	`ExDataSketch.Storage.DETS`	Per-node	Disk
CubDB	`ExDataSketch.Storage.CubDB`	Per-node	Disk
Mnesia	`ExDataSketch.Storage.Mnesia`	Multi-node	Disk+RAM
Ecto	`ExDataSketch.Storage.Ecto`	Multi-node	Database

Configuration

Backends can be enabled or disabled via application config:

config :ex_data_sketch, :persistence_backends,
  ets: [enabled: true],
  dets: [enabled: true],
  cubdb: [enabled: true],
  mnesia: [enabled: true],
  ecto: [enabled: true]

When not explicitly configured, a backend defaults to enabled if its runtime dependency is available.

Summary

Types

delete_opts()

key()

load_opts()

merge_opts()

save_opts()