Tutorials for Data Science , Machine Learning, AI & Big Data – Analytics
This tutorial attempts to give you overall understanding of Big Data in analytics and various strategies. It also talks about HDFS – the most important component of hadoop in details.
Continue reading “Hadoop Tutorial :Intro to Big Data and HDFS”
This was a research paper that we submitted to ICAPADS-2012 an IEEE – Institute of High performance distributed computing conference . It talks about a map reduce based solution to maze traversal problem which is applicable in many practical problems.
Continue reading “Research Paper : Parallel Computing Solutions – Hadoop Mapreduce”
This article talks about different MongoDB concepts and also gives step by step Installation guideline on Windows OS.
Continue reading “MongoDB Tutorial : Introduction and Step by Step Installation”
This tutorial talks about various resources that you can use to leard about hadoop and map reduce. It also talks about how you can think about learning about Big data as a subject in totality
Continue reading “Hadoop Tutorial : Getting started with Hadoop and Mapreduce”
In the last article Sqoop : Hadoop : Importing data from RDBMS to HDFS we explored basic feature of importing the data in HDFS using Sqoop. In this article we will try to explore other very important tools that Sqoop provides.
Continue reading “Sqoop Tutorial : Hadoop : Other Sqoop capabilities explored”
In this article we will go through a very important technique – importing data from SQL table to HDFS. We will do so on a sample database say ‘bigdata’ and a sample table say ’employee’ containing employee data.
We will do this in 3 parts. Part 1 will be in scope of this article. We will look at the next parts in subsequent article
Continue reading “Sqoop Tutorial : Hadoop : Importing data from RDBMS to HDFS”
In this hadoop tutorial we will have a look at the modification to our previous program wordcount with our own custom mapper and reducer by implementing a concept called as custom record reader. Before we attack the problem let us look at some theory required to understand the topic.
Continue reading “Hadoop Tutorial : Custom Record Reader with TextInputFormat”
So here is the next article in series. In the last post we learnt how to write wordcount without using explicit custom mappers or reducers. You can find the post here
Today we will go a step ahead and we will rewrite the same wordcount program by writing our own custom mappers as well as reducers.
We will use 2 classes in addition to our wordcount class.
Class WCMap Continue reading “Hadoop : WordCount with Custom Mapper and Reducer”
So I was trying out my first hadoop program and I was little wary of writing mapper and reducer. But I still wanted to write the program to give me the word count for all words in the input files
So I wrote a driver program of hadoop with map class as a TokenCounterMapper Class. This class is provided by hadoop and it tokenizes the input text and emits each word with count 1.
Just the recipe that I ordered …
Now I needed a reducer which Continue reading “Hadoop : A wordcount without explicit mapper/reducer”
Tutorials for Data Science , Machine Learning, AI & Big Data 