YugabyteDB 1.2 has passed Jepsen testing, a comprehensive benchmarking framework for distributed systems, using the YCQL API. The test suite was analyzed by Kyle Kingsbury, the creator of the Jepsen test suite, who identified three safety issues that were fixed in YugabyteDB 1.2. These issues related to snapshot isolation, linearizable counters, and sets, which were addressed through changes to the locking subsystem, Raft implementation, and HLCs. The testing also highlighted the importance of clock skew tolerance, high-performance multi-region transactions, and stable infrastructure. However, the testing revealed some areas for improvement, including new user experience, partition tolerance, and documentation. Despite these challenges, YugabyteDB demonstrated its ability to handle massive scale and low latencies, making it a promising database solution for distributed systems.