[IGNITE-17198] Minimal implementation of pure in-memory storage (with in-memory RAFT)

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-beta1
• Component/s: persistence
• Labels: ignite-3
• Epic Link: In-memory store
• Assignee: Roman Puchkovskiy
• Reporter: Roman Puchkovskiy
• Reviewer: Semyon Danilov
• Created: 20/Jun/22 09:58
• Updated: 13/Oct/22 12:00
• Resolved: 30/Jun/22 08:10

Description

This is about the simpliest case possible: stable topology, nodes never leave, corner cases are not handled.

What has to be done:

1. Volatile RAFT meta storage
2. Create volatile RAFT storages for a RAFT group (meta and logs) when RAFT group is about volatile storage; create persistent RAFT storages otherwise

What does not need to be done:

1. Now, RAFT snapshots use files. We should not change this behavior in this task

Issue Links

• links to: GitHub Pull Request #908