A Lambda function has reserved concurrency set to 8, but throttling occurs when only 4 concurrent invocations happen. What is the most probable reason?

medium📝 Debug Q7 of 15

AWS - Lambda

AThe account-level concurrency limit is lower than 8, restricting available concurrency

BThe function's memory size is too small causing throttling

CThe function's timeout is set too low, causing early termination

DReserved concurrency setting does not affect throttling behavior

Step-by-Step Solution

Solution:

Step 1: Understand concurrency limits
Reserved concurrency is a per-function limit, but account-level concurrency caps total concurrent executions.
Step 2: Analyze throttling cause
If account concurrency limit is below 8, the function cannot use full reserved concurrency.
Step 3: Exclude other options
Memory size and timeout do not directly cause throttling; reserved concurrency does affect throttling.
Final Answer:
The account-level concurrency limit is lower than 8, restricting available concurrency -> Option A
Quick Check:
Account concurrency limits override function reserved concurrency [OK]

Quick Trick: Account concurrency limits can restrict function concurrency [OK]

Common Mistakes:

MISTAKES

Assuming memory or timeout settings cause throttling
Believing reserved concurrency alone guarantees no throttling
Ignoring account-level concurrency limits

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More AWS Quizzes

A Lambda function has reserved concurrency set to 8, but throttling occurs when only 4 concurrent invocations happen. What is the most probable reason?

Step 1: Understand concurrency limits

Step 2: Analyze throttling cause

Step 3: Exclude other options

Final Answer:

Quick Check:

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