The Hadoop framework provides a mechanism for coping with machine issues such as faulty configuration or impending hardware failure. MapReduce detects that one or a number of machines are performing poorly and starts more copies of a map or reduce task. All the tasks run simultaneously and the task finish first are used. This is called:
A) Combine
B) IdentityMapper
C) IdentityReducer
D) Default Partitioner
E) Speculative Execution

Question

Quizplus · Accepted Answer

Speculative Execution is a feature in Hadoop's MapReduce that launches duplicate tasks to handle slow-running tasks, ensuring faster completion by using the results of the task that finishes first.

The Hadoop Framework Provides a Mechanism for Coping with Machine