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

A friend of mine asked me which would be better, a course on Java or a course on big data or Hadoop. All I could manage was a blank stare. Do you have any ideas?
A course is bigdata will be more better. But honestly as a freshers getting a job in big data is little difficult. So my suggestion will be do a course on both java and bigdata, apply for job and what...
Srikumar
0 0
5
How many nodes can be there in a single hadoop cluster?
A single Hadoop cluster can have **thousands of nodes**, depending on hardware and configuration.
Tahir
0 0
7
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

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

Ask a Question

Related Lessons

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...

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...

Big Data
Bigdata Large amount of data and data may be various types such as structured, unstructured, and semi-structured, the data which cannot processed by our traditional database applications are not enough....

Bigdata hadoop training institute in pune
BigData What is BigData Characterstics of BigData Problems with BigData Handling BigData • Distributed Systems Introduction to Distributed Systems Problems with Existing Distributed...

How to create UDF (User Defined Function) in Hive
1. User Defined Function (UDF) in Hive using Java. 2. Download hive-0.4.1.jar and add it to lib-> Buil Path -> Add jar to libraries 3. Q:Find the Cube of number passed: import org.apache.hadoop.hive.ql.exec.UDF; public...
S

Sachin Patil

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 >

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