DataEngPrep.tech
QuestionsPracticeAI CoachDashboardPacksBlog
ProLogin
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 readPremium

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....

🤖 Analyze Your Answer
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.

The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations covering performance optimization and real-world examples.

This answer is partially locked

Unlock the full expert answer with code examples and trade-offs

Recommended

Start AI Mock Interview

Practice real interviews with AI feedback, track progress, and get interview-ready faster.

  • Unlimited AI mock interviews
  • Instant feedback & scoring
  • Full answers to 1,800+ questions
  • Resume analyzer & SQL playground
Create Free Account

Pro starts at $24/mo - cancel anytime

Just need answers for quick revision?

Download curated PDF interview packs

Interview Packs
1,800+ real interview questions sourced from 5 top companies
AmazonGoogleDatabricksSnowflakeMeta
This answer is in the DE Mastery Vault 2026
1,863 questions with expert answers across 7 categories →

Free: Top 20 SQL Interview Questions (PDF)

Get the most asked SQL questions with expert answers. Instant download.

No spam. Unsubscribe anytime.

Related Cloud/Tools Questions

easyWhat are Airflow Operators? Give examples.FreeeasyExplain the difference between Azure Data Factory (ADF) and Databricks.FreeeasyHow do you handle data security and compliance in a cloud environment?FreehardWhat are the key components of AWS Glue, and how do they work together?FreeeasyWhat is Azure Data Factory (ADF), and what are its main components?Free

Want to know if YOUR answer is good enough?

Paste your answer and get instant AI feedback with a FAANG-level improved version.

Analyze My Answer — Free

According to DataEngPrep.tech, this is one of the most frequently asked Cloud/Tools interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.

← Back to all questionsMore Cloud/Tools questions →