How many instances of Job tracker can run on Hadoop cluster ?

Question

a. 1
b. 2
c. 3
d. 4

Answer 1

The correct answer is option A (one). Job Tracker is a daemon service that helps in submitting and tracking MapReduce jobs in Hadoop. There is only one instance of a job tracker that can run on Hadoop Cluster. Job tracker can be run on the same machine running the Name Node but in a typical production cluster its run on a separate machine.

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