two-phase aggregation

Youzan Coder

Jul 7, 2022 · Big Data

Optimizing Apache Doris Performance: A Case Study in Query Processing

Youzan replaced ClickHouse and Druid with Apache Doris, refined its vectorized engine by eliminating deserialization overhead in the merge‑aggregation phase, achieving roughly a 30 % query‑time boost, and validated compatibility through SQL rewriting and traffic replay, while planning further SIMD‑based optimizations and broader adoption.