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Amazon Web Services (AWS) - Interview Questions and Answers for 'Lambda' - 38 question(s) found - Order By Rating

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 Q1. Which one of AWS Lambda or API Gateway is a compute service ?Amazon Web Services (AWS)
Ans. AWS Lambda

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 Q2. What is arrow function in Typescript ? TypeScript
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 Q3. What are the advantages and disadvantages of Lambda Expression ?Core Java
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 Q4. Can we use Param Store with AWS Lambda ?Amazon Web Services (AWS)
Ans. Yes

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 Q5. How can we take snapshots and track changes to environment variables in Elastic Beanstalk or Lambda ? Amazon Web Services (AWS)
Ans. We can use AWS Config

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 Q6. Which is a better way to keep environment specific configuration in AWS Lambda - Environment Variables or external service like S3 or RDS ? Amazon Web Services (AWS)
Ans. Possible Answer - Env variable or use parameter store

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 Q7. How do you manage environment specific configuration for your lambda functions ?Amazon Web Services (AWS)
Ans. We are using Yaml for initializing configuration and Environment Variables for overriding them.

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 Q8. Why serverless is called serverless if there are actually servers serving the requests ?Infrastructure
Ans. Because Vendors need not worry about provisioning , managing and maintaining the servers and it's intrinsically taken care of by AWS.

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 Q9. What is the use case of having Code Commit trigger within AWS Lambda ?Amazon Web Services (AWS)
Ans. If we would like a program to be executed if someone commits code to the repository.

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 Q10. What are the different trigger types in AWS Lambda ?Amazon Web Services (AWS)
Ans. Api Gateway
Alexa
CloudFront
CloudWatch
Code Commit
Kinesis
S3
SNS

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 Q11. What are the factors on which Lambda usage is priced ?Amazon Web Services (AWS)
Ans. No of requests, computation duration, assigned RAM

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 Q12. What are the advantages and disadvantages of using Lambda over EC2 ?Amazon Web Services (AWS)
Ans. Advantages -

Much Cheaper
Continuous scaling
Higher level and Serverless

Disadvantages -

Warm up time
Limited flexibility in terms of technologies
Limited control

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 Q13. How does AWS Lambda handle failure during event processing?Amazon Web Services (AWS)
Ans. In AWS Lambda we can run a function in synchronous or asynchronous mode. In synchronous mode, if AWS Lambda function fails, then it will just give an exception to the calling application. In asynchronous mode, if AWS Lambda function fails then it will retry the same function at least 3 times.If AWS Lambda is running in response to an event in Amazon DynamoDB or Amazon Kinesis, then the event will be retried till the Lambda function succeeds or the data expires. In DynamoDB or Kinesis, AWS maintains data for at least 24 hours.

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 Q14. How can we schedule Lambda function to run daily ?Amazon Web Services (AWS)
Ans. We can schedule that through CloudWatch.

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 Q15. What would you do if you see an error thrown by a lambda function as "Access Denied" while doing something with S3 ?Amazon Web Services (AWS)
Ans. Just like people , AWS resources too have execution roles or permissions. Seems like in such a situation Lambda function may not have sufficient privileges to perform operations on S3. For example - The execution role of Lambda may just have read permissions on S3 and we may be trying to perform PutObject operation.

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 Q16. Have you used Java 8 Lambda expressions ?Core Java
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 Q17. What are you using AWS lambda for ?Amazon Web Services (AWS)
Ans. We are using it for computation (EC2) , Storage (S3) and Database (RDS)

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 Q18. Write code to get count of every 5 letter word in a string using lambda expression

Core Java
Ans. String str = "I had been saying that he had been there";

Map<String,Long> countWords = Arrays.asList(str.split(" ")).stream().filter(p->p.length() = 5).collect(Collectors.groupingBy(p->p,Collectors.counting()));

System.out.println(countWords);

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 Q19. How to assign a static or IP range to Lambda Function ?Amazon Web Services (AWS)
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 Q20. What should we do If we need to know the IP of the machine where Lambda function runs ?Amazon Web Services (AWS)
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 Q21. How to know IP of the machine where lambda function runs ?Amazon Web Services (AWS)
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 Q22. Can we reserve resources in AWS Lambda just like we do for Ec2 instances ?Amazon Web Services (AWS)
Ans. You can have reserved capacity with AWS Lambda. This guarantees that this number of concurrent Lambdas are always available for that function.

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 Q23. What are the benefits of using AWS Lambda over EC2 ?Amazon Web Services (AWS)
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 Q24. Can we build web services using AWS Lambda ?Amazon Web Services (AWS)
Ans. We have to complement it to AWS Gateway API.

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 Q25. Can you explain the integration between API Gateway and Lambda if we wish to develop services using these tools.Amazon Web Services (AWS)
Ans. We can create API gateway and give the name of lambda function in order to be linked with lambda function, deploy the API and whenever request will be made from API it will directly be linked to lambda function to perform further process.

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 Q26. What are the problems one could face while working with serverless technologies like AWS Lambda ?Amazon Web Services (AWS)
Ans. Warm up time for certain technologies like Java ( JVM Warmup )

Performance

Size of Deployable ( Bigger size packaging should go in S3 )

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 Q27. What is the difference between AWS Gateway API and Lambda ?Amazon Web Services (AWS)
Ans. AWS API Gateway is the endpoint URI to get invoke. Whereas Lambda is the compute function being invoked from API Gateway or S3 or SNS

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 Q28. Tell me something about Amazon Lambda.Amazon Web Services (AWS)
Ans. AWS Lambda is an event-driven, serverless computing platform provided by Amazon as a part of Amazon Web Services. It is a computing service that runs code in response to events and automatically manages the computing resources required by that code. It was introduced in November 2014.

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 Q29. Given a collection of Employee objects, how can we get the customers with name starting with 'A' using lambda expression.Core Java
Ans. List emp = Arrays.asList("American", "Indian", "Finn");
emp.stream().filter(em -> em.startsWith("A")).forEach(System.out.println);

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 Q30. Lets say we have a set "set1" with objects of Class A, Class has a non static string called element1, Write a code ( using lambda expression ) to see if there is any object in the set with element1 = "Hello". Core Java
Ans. set1.stream().filter(p->p.element1.equals("Hello")).findAny().isPreent();

or

set1.stream().map(A::getElement1).anyMatch("Hello"::equals)

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