BIG DATA UNIT -III

What is Amazon Elastic MapReduce (EMR) primarily used for?

• Managing relational databases

• Running big data analytics and processing large datasets

• Hosting websites

• Running containerized applications

What is the primary function of a Combiner in MapReduce?

• To combine the final output

• To optimize performance by reducing data transfer

• To replace the Reducer

• To act as an intermediate Mapper

What is the role of the Mapper in the MapReduce framework?

• To manage the overall job execution

• To store the final output

• To sort the data

• To process input data and produce intermediate key-value pairs

Which of the following is a key benefit of using Hadoop for big data processing?

• Dependency on a single server

• Limited scalability

• Ability to process large volumes of data across distributed systems

• High cost of implementation

What is the purpose of the Reducer in the MapReduce process?

• To initiate the MapReduce job

• To handle data storage

• To aggregate and summarize the intermediate key-value pairs

• To filter the input data

What is the default replication factor of HDFS?

• 1

• 2

• 3

• 5

What is the main advantage of using HDFS for data storage?

• High availability and fault tolerance

• Limited data access

• High cost of storage

• Dependency on a single point of failure

Which programming model does Apache Spark use for processing data?

• All of the above

• SQL-like queries

• DataFrame API

• MapReduce

What is the primary purpose of the JobTracker in Hadoop?

• To manage the execution of MapReduce jobs

• To store data in HDFS

• To provide user interfaces

• To monitor system health

Which class in Hadoop is responsible for defining the Map function?

• Reducer

• Mapper

• job

• Combiner