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Consensus Team Update

· 2 min read
Damian Nadales
Damian Nadales
Consensus Team Lead

High level summary​

  • Leios prototype development (Treasury Funding Initiative 4: Ouroboros Leios Implementation):
    • Landed the first voting capability in the Leios prototype: nodes now diffuse votes over a dedicated mini-protocol and a voting thread casts votes on completed endorser-block closures. This is the foundation for committee-based endorsement and is exercised by new threadnet property tests (#1963).
    • Ongoing: reworking the prototype branch ("Leios prototype remake") to target the same ouroboros-consensus-3.0.1.0 release that ships in cardano-node 11.0.1, so downstream consumers building against that node release can pick up Leios without a separate consensus branch (#2041).
    • Ongoing: adding late-join support, so a node that joins the network after an endorser block was produced can still resolve the resulting certified blocks (#2040).
    • Ongoing: replacing the placeholder voting from #1963 with stake-based committee selection and real BLS signatures, so votes are individually validated before being relayed (#2039).
    • Ongoing: performance work on the in-memory Leios database to remove contention and laziness issues that were causing nodes to time out under load (#2032).
  • LedgerDB cleanup (Treasury Funding Initiative 10: LSM including UTXO-HD):
    • Retired the V1 LedgerDB implementation and the LMDB backing store. V2 has been the default for some time; removing V1 deletes a large amount of now-unreachable code, drops the LMDB dependency, and simplifies the LedgerDB API (for example, snapshots no longer block the caller, and the tryFlush no-op is gone) (#2030). This paves the way for adding more tables to the ledger state, enabling them to be stored on disk.