Lakehouse Research Base

Aug 25, 2026 · Big Data

StarRocks on Paimon: Morning Fast, Daytime Slow - Root Cause & Layered Optimization

This article analyzes why identical StarRocks queries on Paimon external tables run fast in early morning but slow dramatically during daytime peaks, identifying five layered root causes from file fragmentation to storage pressure, and provides a systematic troubleshooting methodology plus a four-layer optimization framework covering source governance, compute caching, storage scaling, and business scheduling.