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What’s the relationship between JobTrackers and TaskTrackers?

What’s the relationship between JobTrackers and TaskTrackers?

PrepAway - Latest Free Exam Questions & Answers

A.
The JobTracker runs on a single master node and accepts MapReduce jobs from clients. A
TaskTracker runs on every slave node and is responsible for managing actual map and reduce
tasks.

B.
Every node in the cluster runs both a JobTracker and a TaskTracker. The JobTrackers manage
jobs, and the TaskTrackers are responsible for managing actual map and reduce tasks.

C.
The TaskTrackers runs on a single master node and accepts MapReduce jobs from clients. A
JobTracker runs on every slave node and is responsible for managing map and reduce tasks.

D.
The JobTracker runs on a single master node, but forks a separate instance of itself for every
client MapReduce job. A TaskTracker runs on every slave node and is responsible for managing
actual map and reduce tasks.

Explanation:
http://hadoop.apache.org/mapreduce/docs/r0.22.0/mapred_tutorial.html (Overview, 4th paragraph)

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