This article provides a comprehensive technical overview of YugabyteDB, covering its two‑layer logical architecture, tablet‑based distributed storage with Raft groups, RocksDB‑backed local storage design, hybrid hash‑range partitioning, and the MVCC‑based two‑phase‑commit transaction model using Hybrid Logical Clocks.
This article explains why distributed databases need precise clocks, compares central, logical, and hybrid clock designs, and shows how hybrid logical clocks (HLC) together with two‑phase commit and other transaction techniques enable consistent, high‑throughput distributed transactions.
The article introduces CB‑SQL, JD Retail’s next‑generation elastic database based on CockroachDB, and comprehensively explains its overview, layered architecture, storage replication, cluster management, MVCC, hybrid logical clocks, lock‑free distributed transactions, CDC changefeeds, and SQL interface support.
The article explains how distributed systems achieve linearizability by using logical clocks, TrueTime, Hybrid Logical Clocks, and Timestamp Oracle mechanisms to establish a global ordering of events despite clock skew and network delays.
