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

Is an mba persuing student eligible for persuing hadoop course?
Yes there are some institutes are offering courses on big data . Those are like MBA in analytics. Google it you will find more info
Osheen
0 0
9
Is there a list of the world's largest Hadoop clusters on the web?
No . As pf now Yahoo has tested with 5000 nodes . but there is no such information .
Nishant
0 0
7
how much time will take to learn Big data development course and what are the prerequisites
weekdays 4 weeks and weekend 5 weeks.it is 30 hours duration
Venkat
My name is Rajesh , working as a Recruiter from past 6 years and thought to change my career into software (development / admin/ testing ) am seeking for some suggestion which technology I need to learn ? Any job after training ? Or where I can get job within 3 months after finishing my training programme- your advices are highly appreciated
Mr rajesh if you want to enter in to software Choose SAP BW AND SAP HANA because BW and HANA rules the all other erp tools next 50 years.it provides rubust reporting tools for quicker decesion of business It very easy to learn
Rajesh
1 0
6

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

Ask a Question

Related Lessons

Big DATA Hadoop Online Training
Course Content for Hadoop DeveloperThis Course Covers 100% Developer and 40% Administration Syllabus.Introduction to BigData, Hadoop:- Big Data Introduction Hadoop Introduction What is Hadoop? Why Hadoop?...

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...

How can you recover from a NameNode failure in Hadoop cluster?
How can you recover from a Namenode failure in Hadoop?Why is Namenode so important?Namenode is the most important Hadoop service. It contains the location of all blocks in the cluster. It maintains the...
B

Biswanath Banerjee

0 0
0

Loading Hive tables as a parquet File
Hive tables are very important when it comes to Hadoop and Spark as both can integrate and process the tables in Hive. Let's see how we can create a hive table that internally stores the records in it...

How to change a managed table to external
ALTER TABLE <table> SET TBLPROPERTIES('EXTERNAL'='TRUE') This above property will change a managed table to an external table

Rahul Sharma

0 0
0

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 >

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