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Home/Questions/Cloud/Tools/In ADF, how do you handle a scenario where you need to process only new or changed files from a source?

In ADF, how do you handle a scenario where you need to process only new or changed files from a source?

Cloud/Toolseasy0.2 min read

Approaches: (1) Watermark—control table stores last processed timestamp; filter LastModified > watermark. (2) Event-based trigger on blob creation. (3) GetMetadata → filter by date in ForEach. (4) Move processed to archive....

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Frequency
Low
Asked at 1 company
Category
179
questions in Cloud/Tools
Difficulty Split
104E|27M|48H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Persistent Systems

Why This Question Matters

This easy-level Cloud/Tools question appears frequently in data engineering interviews at companies like Persistent Systems. While less common, it tests deeper understanding that distinguishes strong candidates.

How to Approach This

Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.

Expert Answer
43 words

Approaches: (1) Watermark—control table stores last processed timestamp; filter LastModified > watermark. (2) Event-based trigger on blob creation. (3) GetMetadata → filter by date in ForEach. (4) Move processed to archive. Best practice: Event for real-time; watermark for batch; idempotency; log processed files.

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