As a developer tools analyst, here is a comparison of Apache Doris and Vitess for senior engineers: Apache Doris and Vitess are two distinct open-source projects with differing focuses, reflected in their momentum, community sizes, and use cases. Apache Doris, with 15,154 stars and a recent surge of 127 stars in the last 30 days, indicates a strong and growing community interest in its unified analytics database capabilities. In contrast, Vitess, boasting 20,845 stars and 158 new stars in the same period, suggests a more established project with a slightly accelerating pace, catering to the need for horizontal scaling of MySQL databases. The community size around Vitess appears larger and more mature, potentially due to its focus on a widely adopted technology (MySQL), implying broader applicability and a larger user base seeking scalability solutions. Apache Doris's community, while substantial, seems to be growing at a comparable rate to Vitess in recent times, possibly attracting a newer wave of users interested in unified analytics solutions. Use cases diverge significantly: Apache Doris is suited for high-performance analytics workloads, appealing to teams requiring a unified database for complex queries and real-time analytics. Vitess, on the other hand, is ideal for existing MySQL deployments needing seamless horizontal scaling, targeting teams facing scalability bottlenecks with their current MySQL infrastructure. Both projects cater to senior engineers but address different architectural challenges within the database ecosystem.