The answer is to reduce the batch size in the skillset definition, as HTTP 429 errors directly indicate throttling caused by excessive call volume from your custom skill. When your Azure AI Search indexer processes documents in large batches, it fires too many requests per second at the Azure Machine Learning endpoint, triggering the service’s rate limits. This question tests your understanding of custom skill throttling and the HTTP 429 fix within the AI-102 exam’s focus on optimizing indexing pipelines. A common trap is choosing to increase parallel requests, which would worsen the throttling, or altering the skill’s input, which doesn’t address the call rate. Remember the mnemonic “Big Batches Bring 429s” to recall that reducing batch size is the targeted fix for throttling in custom skills.
AI-102 Practice Question: Implement knowledge mining and information extraction solutions
This AI-102 practice question tests your understanding of implement knowledge mining and information extraction solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You have an Azure AI Search solution that indexes customer support tickets. The index includes a 'category' field that should be automatically populated using a custom skill that calls an Azure Machine Learning model. However, the skill fails intermittently with HTTP 429 errors. What is the most likely cause and the best fix?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The skill execution batch size is too large, causing high call volume; reduce batch size in the skillset definition.
HTTP 429 indicates throttling. The custom skill is being called too frequently. Option B reduces the batch size to lower the call rate. Option A increases parallel requests, making it worse. Option C changes the skill's input, not the throttling issue. Option D is plausible but less specific than reducing batch size.
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 skill has a timeout set too short; increase the timeout.
Why it's wrong here
429 is throttling, not timeout.
✓
The skill execution batch size is too large, causing high call volume; reduce batch size in the skillset definition.
Why this is correct
Reducing batch size decreases calls per execution.
Clue confirmation
The clue words "best", "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The indexer runs too frequently; increase the indexer schedule interval.
Why it's wrong here
While possible, reducing batch size directly addresses the call rate.
✗
The skill output field mapping is incorrect; fix the mapping.
Why it's wrong here
Incorrect mapping would cause errors, not 429.
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 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 AI-102 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.
Implement knowledge mining and information extraction solutions — This question tests Implement knowledge mining and information extraction solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The skill execution batch size is too large, causing high call volume; reduce batch size in the skillset definition. — HTTP 429 indicates throttling. The custom skill is being called too frequently. Option B reduces the batch size to lower the call rate. Option A increases parallel requests, making it worse. Option C changes the skill's input, not the throttling issue. Option D is plausible but less specific than reducing batch size.
What should I do if I get this AI-102 question wrong?
Identify which AI-102 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.
Are there clue words in this question I should notice?
Yes — watch for: "best", "most likely". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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