Re: [I] [Engine] Support Hotstuff Consensus Protocol [PODC 2019] [incubator-resilientdb]

["DakaiKang (via GitHub)" <gi...@apache.org>]

DakaiKang commented on issue #96:
URL: https://github.com/apache/incubator-resilientdb/issues/96#issuecomment-3428352308

   HotStuff is a highly influential and widely studied consensus protocol in academia.
   A basic implementation of HotStuff is available in the following branch:
   https://github.com/apache/incubator-resilientdb/tree/hotstuff
   
   However, to build a fully resilient HotStuff implementation, several additional mechanisms are required. In the current version, the protocol progresses solely based on messages received — that is, replicas advance to the next round upon receiving either a valid proposal or a sufficient number of valid Vote messages.
   
   To improve robustness, the following recovery mechanisms should be implemented:
   
   1. Timeout mechanism — allows replicas to advance to the next view if no valid messages are received before a specified timeout period.
   
   2. Catch-up mechanism — enables a replica to fetch missing proposals or transactions from other replicas when it receives a quorum certificate (QC) for a proposal it has not yet received.
   
   3. (Optional) View synchronization mechanism — as described in [Lewis Pye’s work](https://arxiv.org/pdf/2201.01107)
   , which ensures progress and coordination across replicas under adverse network conditions.


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