The answer is that storedBytes: 0 indicates the Glue job failed before writing any log events to CloudWatch. This occurs because the job encountered a failure during its initialization or bootstrap phase, before the Spark context or any logging framework could emit a single log entry to the designated log stream. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of how AWS Glue job execution and CloudWatch logging interact—specifically, that a log stream is created when the job starts, but storedBytes remains zero if the job crashes before any log output is generated. A common trap is assuming storedBytes: 0 means logs were deleted or expired, but the stream’s existence proves it was created; the zero simply means nothing was ever written. Memory tip: think “zero storedBytes = zero logs written, job died before the first print.”
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Network Topology
A data engineer is investigating a failed AWS Glue job. The engineer runs the CLI command shown in the exhibit to retrieve the latest log stream. The output shows storedBytes: 0. What does this indicate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Glue job failed before writing any log events to CloudWatch.
Option C is correct because storedBytes: 0 means no log events were stored, likely because the job failed before writing any logs or logging was not enabled. Option A is wrong because logs are not expired; they were never written. Option B is wrong because the stream exists. Option D is wrong because the command retrieved the latest stream.
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.
✗
The log stream is from a different Glue job.
Why it's wrong here
The command retrieved the latest stream for the given log group.
✗
The log stream is empty because the job is still running.
Why it's wrong here
The job has finished; if still running, storedBytes might be >0.
✓
The Glue job failed before writing any log events to CloudWatch.
Why this is correct
No logs were written, indicating early failure or logging misconfiguration.
Related concept
Read the scenario before looking for a memorised answer.
✗
The log stream has been expired and deleted.
Why it's wrong here
The stream exists, but no bytes stored.
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.
Trap categories for this question
Command / output trap
The command retrieved the latest stream for the given log group.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Glue job failed before writing any log events to CloudWatch. — Option C is correct because storedBytes: 0 means no log events were stored, likely because the job failed before writing any logs or logging was not enabled. Option A is wrong because logs are not expired; they were never written. Option B is wrong because the stream exists. Option D is wrong because the command retrieved the latest stream.
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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