The answer is to use DynamicFrames instead of DataFrames, along with schema detection and the `applyMapping` transformation. DynamicFrames are purpose-built for AWS Glue to handle schema evolution automatically by allowing new fields to appear in source data without breaking the pipeline, whereas standard Spark DataFrames would fail on schema mismatches. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of how Glue’s schema detection infers structure from Amazon S3 data and how `applyMapping` lets you rename, cast, or drop columns dynamically. A common trap is choosing Spark SQL or Glue crawlers—crawlers handle cataloging, not in-transit transformation, and Spark SQL lacks automatic schema evolution. Remember the mnemonic “DSA” for DynamicFrames, Schema detection, and ApplyMapping to recall the three correct features for handling schema evolution in your pipeline.
DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A data engineer is designing a data pipeline that uses AWS Glue to transform data stored in Amazon S3. The transformation logic must be written in Python and should handle schema evolution automatically. Which THREE features or configurations should the engineer use? (Select THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use `applyMapping` transformations
Correct options: A, B, C. AWS Glue DynamicFrames handle schema evolution automatically. Glue's schema detection can infer schema from data. Using `applyMapping` allows for schema transformations. Option D (Spark SQL) does not handle schema evolution automatically. Option E (Glue crawlers) are for cataloging, not transformation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Schedule a Glue crawler to update the schema
Why it's wrong here
Crawlers are for cataloging, not for transformation logic.
✓
Use `applyMapping` transformations
Why this is correct
Facilitates schema manipulation.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Spark SQL for transformations
Why it's wrong here
Does not handle schema evolution automatically.
✓
Enable schema detection in the Glue job
Why this is correct
Allows automatic schema inference.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use DynamicFrames instead of DataFrames
Why this is correct
DynamicFrames support schema evolution.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use `applyMapping` transformations — Correct options: A, B, C. AWS Glue DynamicFrames handle schema evolution automatically. Glue's schema detection can infer schema from data. Using `applyMapping` allows for schema transformations. Option D (Spark SQL) does not handle schema evolution automatically. Option E (Glue crawlers) are for cataloging, not transformation.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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