HDFS

Big Data Evolution: Migrating on-premise database to Hadoop

Reading Time: 4 minutes We are now generating massive volumes of data at an accelerated rate. To meet business needs, address changing market dynamics as well as improve decision-making, sophisticated analysis of this data from disparate sources is required. The challenge is how to capture, store and model these massive pools of data effectively in relational databases. Big data is not a fad. We are just at the beginning Continue Reading

Do you really need Spark? Think Again!

Reading Time: 5 minutes With the massive amount of increase in big data technologies today, it is becoming very important to use the right tool for every process. The process can be anything like Data ingestion, Data processing, Data retrieval, Data Storage, etc. Today we are going to focus on one of those popular big data technologies i.e., Apache Spark. Apache Spark is an open-source distributed general-purpose cluster-computing framework. Spark Continue Reading

Simple Java program to Append to a file in Hdfs

Reading Time: 2 minutes In this blog, I will present you with a java program to append to a file in HDFS. I will be using Maven as the build tool. Now to start with- First, we need to add maven dependencies in pom.xml. Now we need to import the following classes- import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FSDataOutputStream; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import java.io.*;

Resolving the Failure Issue of NameNode

Reading Time: 2 minutes In the previous blog “Smattering of HDFS“, we learnt that “The NameNode is a Single Point of Failure for the HDFS Cluster”. Each cluster had a single NameNode and if that machine became unavailable, the whole cluster would become unavailable until the NameNode is restarted or brought up on a different machine. Now in this blog, we will learn about resolving the failure issue of Continue Reading

Smattering of HDFS

Reading Time: 2 minutes INTRODUCTION TO HDFS :- Hadoop is an open-source framework that allows to store and process big data in a distributed environment across clusters of computers.It has many similarities with existing distributed file systems. However, the differences from other distributed file systems are significant as it provides high-performance access to data across Hadoop clusters. Like other Hadoop-related technologies, HDFS has become a key tool for managing Continue Reading

BigData Specifications – Part 1 : Configuring MySql Metastore in Apache Hive

Reading Time: 2 minutes Apache Hive is used as a data warehouse over Hadoop to provide users a way to load, analyze and query the data from various resources. Data is stored into databases or file systems like HDFS (Hadoop Distributed File System). Hive can use Spark SQL or HiveQL for the implementation of queries. Now Hive uses its metastore which contains the following information, Ids of tables, Ids Continue Reading

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