[EPIC] [EFM Recovery - M3] Overview

[AlexHentschel]

Broad system-level overview

The following is an overview of which components control the Epoch Fallback Mode [EFM] and which components react to it (all prior to any work on EFM Recovery). Those will probable be the components where the central algorithmic changes will be made.

👉 Design Document in Notion

Components controll EFM mode

The FollowerState (mutator) / ParticipantState implements

• logic for emitting the EpochEmergencyFallbackTriggered notification.
• sets a corresponding flag in the data base

Components that ingest EpochEmergencyFallbackTriggered notification (in-memory)

• committees.Consensus
• BlockTimeController
• EpochLookup
• Metrics: ComplianceCollector and the respective interface ComplianceMetrics
• Pub-sub components for distributing notifications: events.Distributor and corresponding interface protocol.Consumer

Components that read EpochEmergencyFallbackTriggered flag from data base

• InstanceParams reads the flag from data base on each call of EpochFallbackTriggered()
• The protocol State reads the flag from data base when updating the metrics during bootstrapping or opening the state
• The FollowerState (mutator) / ParticipantState reads the flag from data base when finalizing a new block

Tasks

Beta Give feedback

1. [EPIC | M2] Implement epoch state machine in Dynamic Protocol State #5762
   6 of 6
   S-BFT S-Consensus +2
   
2. [EFM Recovery] Update bootstrapping process to be able to join the network in EFM. #5127
   1 of 1
   Protocol S-BFT +2
   
3. [EFM] EpochExtended event and emission logic #5723
   2 of 5
   S-BFT S-Epochs +2
   
4. [EFM] EpochExtensionLength Protocol Parameter #5725
   4 of 5
   S-BFT S-Epochs +2
   
5. [EFM] Modify Protocol State Machine support transitioning from EFM #5728
   S-BFT S-Epochs +2
   
6. [EFM] Invalid Service Events shortly after Epoch Commit #5631
   +0
   
7. [EFM] EpochRecover service event processing #5727
   S-BFT S-Epochs +2
   
8. [EFM] Dynamic Protocol State maintains EFM by injecting EpochExtensions #5726
   S-BFT S-Epochs +2
   
9. [EFM] Dynamic Protocol State injects EpochExtension when entering EFM #5724
   S-BFT S-Epochs +2
   
10. [EFM] Add EpochExtension to Epoch Data Model #5717
    S-BFT S-Epochs +2
    
11. [EFM | M3] Event emission and metrics on finalization #6013
    +0
    

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