Raft event log

Generic in-house Raft-replicated append-only log used as journal or sequencer.

Provider: default
Kind: Event store
Category: Messaging
Official docs: https://raft.github.io/

Properties · 4 set by this component

property	type	values	required	kind default	this component
journaled	boolean	—	no	true	▸ true
managed	boolean	—	no	false	inherited
nodes · component property	integer	—	no	3	inherited
replication	enum	none \| raft \| primary-replica	no	none	▸ raft
role	enum	journal \| sequencer	no	journal	▸ journal
snapshotIntervalEvents	integer	—	no	—	inherited
storage	enum	mmap \| rocksdb \| database	no	database	▸ mmap

Rules that apply · 1

Every rule whose selector covers this component's kind or its category. Whether a rule fires depends on the design: its properties, its edges and its groups.

Stateful engine pinned to a single zoneerror

stateful-engine-pinned-to-single-zone

A matching engine, coordination service or event store living in exactly one availability zone, with no failover and no replication, is lost with that zone. Everything that depends on it stops with it.

— all of these hold:
— the node sits inside exactly 1 availability-zone group
— any of these hold:
— the node's `failover` is "none"
— the node's `replicated` is false
— the node's `replication` is "none"

Use it in a design

nodes:
  - { id: "raft-event-log", component: "raft-event-log" }

Other Event store products · 4

Axon Serveraxon-serverevent-store Apache BookKeeperbookkeeperevent-store Generic event storeevent-storeevent-store EventStoreDBeventstoredbevent-store

Source

1# yaml-language-server: $schema=../../schema/component.schema.json
2# Generic in-house Raft-replicated append-only log (exchange journals, sequencers, custom event stores).
3# Three voting nodes and memory-mapped segments are the usual shape.
4schemaVersion: "1"
5type: "component"
6id: "raft-event-log"
7kind: "event-store"
8provider: "default"
9docs: "https://raft.github.io/"
10defaults:
11  replication: "raft"
12  journaled: true
13  storage: "mmap"
14  role: "journal"
15properties:
16  nodes:
17    type: "integer"
18    default: 3

The same page as markdown, for an agent: /catalogue/components/raft-event-log.md