From TB-Scale MongoDB to Doris: 5 Critical Challenges and Fixes with Apache SeaTunnel

Recently, in several data middle-platform projects, we have frequently used Apache SeaTunnel to synchronize data from MongoDB to Apache Doris. Honestly, this task looks simple, but once you actually get started, you realize there are quite a few pitfalls. Especially in production environments, where data volume is large and structures are complex, a small oversight can easily lead to problems. This article does not intend to repeat those basic configuration steps—there are already plenty of them online. I want to focus on the areas in real production environments where people are most likely to stumble. Particularly when you are dealing with TB-level MongoDB collections that need to be stably synchronized to Doris for real-time analysis, the following five pitfalls are almost inevitable. I will combine specific error logs, troubleshooting approaches, and the solutions our team has explored to help you eliminate these issues one by one. 1. Data Type Mapping: BSON-to-SQL Conversion Issue