What happens if the number of reducers is 0 in Hadoop?

Asked by Last Modified  

1 Answer

Learn Hadoop +1

Follow 1
Answer

Please enter your answer

If we set the number of Reducer to 0 (by setting job. setNumreduceTasks(0)), then no reducer will execute and no aggregation will take place. In such case, we will prefer “Map-only job” in Hadoop. In Map-Only job, the map does all task with its InputSplit and the reducer do no job
Comments

Related Questions

Can anyone suggest about Hadoop?
Hadoop is good but it depends on your experience. If you don't know basic java, linux, shell scripting. Hadoop is not beneficial for you.
Ajay
I want a lady Hadoop Trainer.
Yes. Career bridge it services, one of the best training insitute in hyderabad. we provide lady trainer for ofline / online batches. Please call and contact @970-532-3377. So that you can get all the details about trainings and career guiidance.
Chandrika
I want to learn Hadoop admin.
Hi Suresh, I am providing hadoop administration training which will lead you to clear the Cloudera Administrator Certification exam (CCA131). You can contact me for course details. Regards Biswanath
Suresh
What is the response by teachers for basic members?
It seems to be catching up. However the general figures are low.
Sanya
0 0
9
Should Cloudera or MapR be used for Hadoop distribution?
Cloudera is preferred as MapR is discontinued and Cloudera offers strong support and integration.
Chandra
0 0
5

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

A Helpful Q&A Session on Big Data Hadoop Revealing If Not Now then Never!
Here is a Q & A session with our Director Amit Kataria, who gave some valuable suggestion regarding big data. What is big data? Big Data is the latest buzz as far as management is concerned....

Best way to learn any software Course
Hi First conform whether you are learning from a real time consultant. Get some Case Studies from the consultant and try to complete with the help of google not with consultant. Because in real time same situation will arise. Thank you

BigDATA HADOOP Infrastructure & Services: Basic Concept
Hadoop Cluster & Processes What is Hadoop Cluster? Hadoop cluster is the collections of one or more than one Linux Boxes. In a Hadoop cluster there should be a single Master(Linux machine/box) machine...

Hadoop Development Syllabus
Hadoop 2 Development with Spark Big Data Introduction: What is Big Data Evolution of Big Data Benefits of Big Data Operational vs Analytical Big Data Need for Big Data Analytics Big...

Hadoop v/s Spark
1. Introduction to Apache Spark: It is a framework for performing general data analytics on distributed computing cluster like Hadoop.It provides in memory computations for increase speed and data process...

Recommended Articles

Hadoop is a framework which has been developed for organizing and analysing big chunks of data for a business. Suppose you have a file larger than your system’s storage capacity and you can’t store it. Hadoop helps in storing bigger files than what could be stored on one particular server. You can therefore store very,...

Read full article >

Big data is a phrase which is used to describe a very large amount of structured (or unstructured) data. This data is so “big” that it gets problematic to be handled using conventional database techniques and software.  A Big Data Scientist is a business employee who is responsible for handling and statistically evaluating...

Read full article >

In the domain of Information Technology, there is always a lot to learn and implement. However, some technologies have a relatively higher demand than the rest of the others. So here are some popular IT courses for the present and upcoming future: Cloud Computing Cloud Computing is a computing technique which is used...

Read full article >

We have already discussed why and how “Big Data” is all set to revolutionize our lives, professions and the way we communicate. Data is growing by leaps and bounds. The Walmart database handles over 2.6 petabytes of massive data from several million customer transactions every hour. Facebook database, similarly handles...

Read full article >

Find Hadoop near you

Looking for Hadoop ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you