自学编程遇到瓶颈怎么办？

遇到瓶颈是正常的。建议：1. 动手做项目 (Project-based Learning)，不要只看视频；2. 善用 AI 助手 (如 Cursor, ChatGPT) 解释代码和逻辑；3. 加入全球技术社区 (如 Discord, GitHub) 与他人交流；4. 拆解大问题为小模块逐个击破。

如何构建一个具备全球竞争力的开发者作品集 (Portfolio)？

优秀的 Portfolio 不在多而在精。包含 2-3 个完整的、已上线的项目 (Live Demo) 最佳。每个项目应包含：GitHub 源码链接、在线演示地址、以及一份中英文 Readme 文档说明解决了什么问题、使用了什么技术栈。

Intermediate Spark Interview Questions and Answers

12. What is RDD Lineage?

Spark does not support data replication in memory and thus, if any data is lost, it is rebuilt using RDD lineage.

RDD lineage is a process that reconstructs lost data partitions. The best thing about this is that RDDs always remember how to build from other datasets.

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Reviewer: Lightman WangFounder of JR Academy

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