[RATIS-2084] IllegalStateException when install snapshot from leader

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.1
• Component/s: gRPC, snapshot
• Target Version/s: 3.1.0
• Assignee: Song Ziyang
• Reporter: Song Ziyang
• Created: 10/May/24 08:11
• Updated: 30/May/24 07:46
• Resolved: 30/May/24 07:46

Description

 

The event sequence that triggered IllegalStateException:

1. Raft Group (A, B, C) with leader A.
2. Client cli adds a new Peer D to the group.
3. Leader A sends snapshot and logs to D, and peer D is successfully bootstrapped.
4. The configuration change log (A,B,C,D) is NOT committed while B timeouts, starts an election, becomes the new leader.
5. Client cli re-send the add-peer-D request to the newly elected leader B.
6. B thoughts the D is a new peer with next-index = 0, tries to send the snapshot to D. D already had the snapshot, so the IllegalStateException occurred.

Issue Links

• links to: GitHub Pull Request #1091