[RATIS-1995] Prevent data loss when a storage is accidentally re-formatted

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: election
• Assignee: Tsz-wo Sze
• Reporter: Tsz-wo Sze
• Created: 10/Jan/24 20:56
• Updated: 10/Jan/24 21:09

Description

Similar to the problem described in RATIS-1677, if the RaftStorage in a peer is accidentally re-formatted, it could cause data loss.

Consider the following

1. Server A and Server B were fast and had commit index 100 while server C had commit index 90.
2. The RaftStorage of Server A was accidentally re-formatted and Server A was restarted. Its commit index became -1.
3. Server C started a leader election and Server A voted for it. The commit index became 90 – it lost the commits from index 91 to index 100.

Issue Links

• is related to: RATIS-1677 Do not auto format RaftStorage in RECOVER