MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -1. A node acts as the Slave and is responsible for executing a Task assigned to it by the JobTracker. Explanation: TaskTracker receives the information necessary for the execution of a Task from JobTracker, Executes the Task, and Sends the Results back to JobTracker.

Detailed explanation-2: -DataNode: DataNode is the slave node that stores all files and processes. Mapper: Mapper maps data or files in the DataNodes.

Detailed explanation-3: -DataNodesare the slave nodes in HDFS. It is a commodity hardware that provides storage for the data.

Detailed explanation-4: -Where sorting is done in MapReduce Job execution? Sorting in MapReduce is on Both Mapper Side as well as Reducer side. The Mapper process the input key value pair from Record Reader and generates output as per custom Business logic, before writing the data the output is partitioned and sorted by key.

Detailed explanation-5: -The MapReduce framework consists of a single master JobTracker and one slave TaskTracker per cluster-node. The master is responsible for scheduling the jobs’ component tasks on the slaves, monitoring them and re-executing the failed tasks.