[RATIS-873] Fix Install Snapshot Notification

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Target Version/s: 1.0.0
• Assignee: Hanisha Koneru
• Reporter: Hanisha Koneru
• Created: 21/Apr/20 23:13
• Updated: 12/May/20 22:10
• Resolved: 12/May/20 22:10

Description

This Jira aims to address the following:

1. When Follower is in the process of installing snapshot and it gets an append entry, it replies with result INCONSISTENCY and the follower next index is updated to the snapshot index being installed. This should not happen as the snapshot installation is still in progress. Follower's next index on the leader should remain the same.
2. After InstallSnapshot is done, Leader should update the commitIndex of the Follower to the installed snapshot index.
3. After InstallSnapshot, when reloading StateMachine, any previously open LogSegment should be closed, if the last entry in the open log is already included in the snapshot.
4. When Follower is notified to install snapshot through StateMachine, the reply should indicate the same. It would help with debugging if the Install Snapshot success reply and Install Snapshot notified replies are distinct.

Issue Links

• links to: Github Pull Request #88