What is concurrency in AWS Lambda?
- The amount of memory allocated to a function
- The duration for which a function can run
- The geographic regions where Lambda functions are deployed
- The number of function instances that can run simultaneously
Concurrency in AWS Lambda refers to the number of function instances that can execute concurrently, controlling how many requests can be processed at the same time.
How does AWS Lambda handle scaling automatically?
- By adjusting the number of function instances based on incoming requests
- By increasing the memory allocation of functions
- By limiting the number of requests per function
- By manually configuring scaling policies
AWS Lambda automatically scales by adjusting the number of function instances to match the incoming request volume, ensuring that there are enough resources to handle the workload.
What happens when multiple requests are received simultaneously by an AWS Lambda function?
- AWS Lambda creates separate instances of the function to handle each request concurrently
- AWS Lambda queues the requests and processes them sequentially
- AWS Lambda randomly selects one request to process and discards the rest
- AWS Lambda rejects the additional requests until previous ones are processed
When multiple requests are received simultaneously, AWS Lambda creates separate instances of the function, allowing each request to be processed concurrently without impacting others.
Strategies such as __________ can help mitigate issues related to cold starts and concurrent execution spikes.
- Auto scaling
- Elastic load balancing
- Provisioned concurrency
- Static scaling
Provisioned concurrency allows you to preallocate resources to a function, reducing cold starts and mitigating issues related to concurrent execution spikes in AWS Lambda.
When architecting for high concurrency, it's crucial to design for __________ to ensure efficient resource utilization.
- Microservices architecture
- Monolithic architecture
- Stateful functions
- Stateless functions
Designing functions to be stateless allows them to scale horizontally and efficiently handle high concurrency in AWS Lambda, ensuring optimal resource utilization.
Scenario: You're experiencing performance issues with your AWS Lambda functions due to high concurrency. What steps would you take to diagnose and address the problem?
- Adjust Lambda Memory Allocation
- Analyze CloudWatch Metrics
- Optimize Code Efficiency
- Scale Lambda Concurrency
Analyzing CloudWatch metrics can provide insights into performance issues caused by high concurrency in AWS Lambda functions.
Scenario: Your application requires bursty traffic handling, with occasional spikes in concurrent executions. How would you configure AWS Lambda to handle this effectively?
- Adjust Memory Allocation
- Configure Provisioned Concurrency
- Enable Auto Scaling
- Implement Queue-based Processing
Configuring provisioned concurrency in AWS Lambda ensures that a specified number of instances are always available to handle bursts of traffic, reducing cold start delays.
Scenario: Your team is designing a serverless architecture for a real-time chat application with thousands of concurrent users. What considerations would you make regarding AWS Lambda concurrency and scaling?
- Implement Event Source Mapping
- Monitor and Auto-scale
- Set Appropriate Concurrency Limits
- Use Multi-Region Deployment
Monitoring Lambda functions and enabling auto-scaling based on metrics such as invocation count or latency can dynamically adjust resources to match demand and ensure optimal performance for a real-time chat application with thousands of concurrent users.
What is the maximum size limit for a Lambda Layer?
- 1 GB
- 10 GB
- 250 MB
- 50 MB
The maximum size limit for a Lambda Layer is 50 MB, allowing you to include libraries, custom runtimes, and other dependencies.
How does AWS Lambda manage concurrency?
- Automatically scales
- Manually configured
- Relies on external services
- Uses a fixed pool
AWS Lambda automatically manages concurrency by scaling the number of function instances in response to incoming requests, ensuring that multiple requests can be processed concurrently.