---
title: "What is JobTracker?"  
description: "What is JobTracker?"  
author: "Anonymous User"  
published: 2015-01-20  
updated: 2020-09-22  
canonical: https://www.mindstick.com/interview/2286/what-is-jobtracker  
category: ".net"  
tags: ["hadoop"]  
reading_time: 1 minute  

---

# What is JobTracker?

**Job Tracker -**\
JobTracker is the service within Hadoop that runs MapReduce jobs on the cluster.\
JobTracker process runs on a separate node and not usually on a DataNode.\
JobTracker is an essential Daemon for MapReduce execution in MRv1. It is replaced by ResourceManager/ApplicationMaster in MRv2.JobTracker receives the requests for MapReduce execution from the client.JobTracker talks to the NameNode to determine the location of the data.

## Answers

### Answer by Anonymous User

**Job Tracker -**\
JobTracker is the service within Hadoop that runs MapReduce jobs on the cluster.\
JobTracker process runs on a separate node and not usually on a DataNode.\
JobTracker is an essential Daemon for MapReduce execution in MRv1. It is replaced by ResourceManager/ApplicationMaster in MRv2.JobTracker receives the requests for MapReduce execution from the client.JobTracker talks to the NameNode to determine the location of the data.


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Original Source: https://www.mindstick.com/interview/2286/what-is-jobtracker

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