**Section 1 — The Context (The 'Why')**
Multi-source pipelines ingest from heterogeneous systems (S3, Kinesis, databases, APIs) into a unified store. The primary challenge is coordinating different latencies (batch vs. stream), schemas, and SLAs....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like EPAM. The answer also includes follow-up discussion points that interviewers commonly explore.
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