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Amazon Web Services (AWS) - Interview Questions and Answers for 'Lambda' - 39 question(s) found - Order By Newest

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Frequently asked at Manhattan Associates ( Based on 2 feedback )
  Q1. What is a Lambda Expression ? What's its use ?Core Java
Ans. Its an anonymous method without any declaration.

Lambda Expression are useful to write shorthand Code and hence saves the effort of writing lengthy Code.

It promotes Developer productivity, Better Readable and Reliable code.

  Sample Code for lambda

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Not frequently asked as it was introduced with Java 8.
 Q2. Difference between final and effectively final ? Why is effectively final even required ?Core Java
Ans. Final variable means a variable that has been declared final and hence cannot be de referenced after initialization. Effective final means a variable that has not been declared final but haven't been reassigned the value after initialization.

First is the regulation that restricts the reassignment and will raise a compilation error if we try to do so. Second is the outcome without the restriction.

Effective Final is the eventual treatment of the variable that is required for many features. For eq - Java 8 requires that local variables referenced from a lambda expression must be final or effectively final.It means all local referenced from lambda expressions must be such that their value shouldn't be changed after initialization whether declared final or not.

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 Q3. Difference between Predicate, Supplier and Consumer ? Core Java
Ans. Predicate represents an anonymous function that accepts one argument and produces a result.

Supplier represents an anonymous function that accepts no argument and produces a result.

Consumer represents an anonymous function that accepts an argument and produces no result.

  Sample Code for Predicate

  Sample Code for Supplier

  Sample Code for Consumer

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 Q4. 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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 Q5. 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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 Q6. Write a Program that gets a set of numbers , filters out the non prime numbers , calculate the factorial of each prime number and then finds the average of all factorials using Lambda expressions
Ans. public class BuggyBread1 {
   
   public static void main(String args[]) {
      
      // Declare and Initialize the Collection
      Set<Integer> intSet = new HashSet<Integer>();

      // Add Elements
      intSet.add(1);
      intSet.add(2);
      intSet.add(3);
      intSet.add(4);
      intSet.add(5);

      double averageOfNonPrimeFactorials = intSet.stream().filter(p->checkIfPrime(p)).collect(Collectors.averagingInt(p->calculateFactorial(p)));
      
      System.out.println(averageOfNonPrimeFactorials );
   }
   
   static private boolean checkIfPrime(int num){
      for(int count=2;count < num;count++){
         if(num % count == 0){
            return false;
         }
      }
      return true;
   }
   
   static private int calculateFactorial(int num){
      int factorial = 1;
      for(int count=num;count > 0;count--){
         factorial = factorial * count;
      }
      return factorial;
   }
}

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 Q7. 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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 Q8. 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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 Q9. 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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 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 does the following lambda expression means ?

helloJava8 ( x-> x%2 )
Ans. helloJava8 receives an Integer as argument and then returns the modulus of that Integer.

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Rarely asked as it was introduced with Java 8.
 Q12. Difference between DoubleSummaryStatistics , IntSummaryStatistics and LongSummaryStatistics ?Core Java
Ans. They all does the same task i.e to compute statistical information on the stream of data. They differ by the way they store the statistical information as they expect a different data type of the values being used.

IntSummaryStatistics and LongSummaryStatistics expect non floating point values and hence stores the statistical information like min,max and sum as non floating values ( int or long ) whereas DoubleSummaryStatistics stores these information as floating value.

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Rarely asked as it was introduced with Java 8.
 Q13. What is the use of :: operator wef from Java 8 ?Core Java
Ans. We can refer to a function using this operator like System.out.println(intList.stream().reduce(Math::max).get());

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 Q14. What is a method reference in Java ?Core Java
Ans. Introduced with java 8 , Method References help us to point to methods by their name.

A method references is described using :: symbol

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 Q15. What is Lambda Calculus ?Core Java
 This question is still unanswered. Can you please provide an answer.


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 Q16. 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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 Q17. 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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 Q18. 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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 Q19. 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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 Q20. 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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 Q21. What are the benefits of using AWS Lambda over EC2 ?Amazon Web Services (AWS)
 This question is still unanswered. Can you please provide an answer.


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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. How to know IP of the machine where lambda function runs ?Amazon Web Services (AWS)
 This question is still unanswered. Can you please provide an answer.


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 Q24. What should we do If we need to know the IP of the machine where Lambda function runs ?Amazon Web Services (AWS)
 This question is still unanswered. Can you please provide an answer.


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 Q25. How to assign a static or IP range to Lambda Function ?Amazon Web Services (AWS)
 This question is still unanswered. Can you please provide an answer.


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 Q26. 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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 Q27. 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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 Q28. Have you used Java 8 Lambda expressions ?Core Java
 This question was recently asked at 'One Click Retail'.This question is still unanswered. Can you please provide an answer.


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 Q29. How can we schedule Lambda function to run daily ?Amazon Web Services (AWS)
Ans. We can schedule that through CloudWatch.

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 Q30. 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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