How do I find duplicates in Hadoop file?

Asked by Last Modified  

Follow 0
Answer

Please enter your answer

Accounting Expert

In reducer please check the number of values grouped for each key. If you have more than one value you know you have a duplicate. If you just want the duplicate values, write out the keys that have multiple values.
Comments

Related Questions

Do I need to learn the Java-Hibernate framework to be a Hadoop developer?
Not At All . To be Hadoop Developer , you need the knowledge of basic core Java programming along with SQL . No one will ask any question in interview on hibernate .
Pritam
0 0
6
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
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
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
I want to pursue career in Data Analyst i.e. Hadoop, currently working in testing professional from last 4 year. Please let me know what�s the opportunity and is my work experience is considerable in Hadoop. Also let me know what need to be prepare for that. Please guide me. Thanks in advance.
Sachin, YEs your work experience will consider as total IT experience. But you need to prepare BigData Hadoop analytic from scratch(start-to end). That means you need to know Hadoop as BigData Hadoop developer...
Sachin

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

Ask a Question

Related Lessons

How To Be A Hadoop Developer?
i. Becoming a Hadoop Developer: Dice survey revealed that 9 out of 10 high paid IT jobs require big data skills. A McKinsey Research Report on Big Data highlights that by end of 2018 the demand for...

Lesson: Hive Queries
Lesson: Hive Queries This lesson will cover the following topics: Simple selects ? selecting columns Simple selects – selecting rows Creating new columns Hive Functions In SQL, of which...

HDFS And Mapreduce
1. HDFS (Hadoop Distributed File System): Makes distributed filesystem look like a regular filesystem. Breaks files down into blocks. Distributes blocks to different nodes in the cluster based on...

Why is the Hadoop essential?
Capacity to store and process large measures of any information, rapidly. With information volumes and assortments always expanding, particularly from web-based life and the Internet of Things (IoT), that...

Design Pattern
Prototype Design Pattern: Ø Prototype pattern refers to creating duplicate object while keeping performance in mind. Ø This pattern involves implementing a prototype interface which tells...

Recommended Articles

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 >

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 >

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