Apache Kafka is an open source project for a distributed publish-subscribe messaging system rethought as a distributed commit log. Kafka stores messages in topics that are partitioned and replicated across multiple brokers in a cluster. Producers send messages to topics from which consumers read.
Variable in Scala is defined as memory locations reserved to store values. When a variable is created, some memory is reserved for the space it will use. Scala has mainly…
As Java is a strongly typed language, everything has a type in Java. Here, strongly typed means every variable/expression has a type and every type is strictly defined. Java compiler…
Java is a general-purpose computer-programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible.
Relational database is a computer-software application that interacts with end-users, other applications, and the database itself to capture and analyze data. A general-purpose DBMS allows the definition, creation, querying, update, and administration of databases.
Apache Spark Streaming execution model is advantageous over traditional streaming systems for its fast recovery from failures, dynamic load balancing, streaming and interactive analytics, and native integration.
What is Data? Before we learn about databases, we need to first understand what data is. Data is information or facts related to an object that is under consideration. In…
Resilient Distributed Dataset (RDD) is the fault-tolerant and immutable primary data structure/abstraction in Apache Spark. It is a distributed collection of objects. The term ‘resilient’ in ‘Resilient Distributed Dataset’ refers…
There are 3 types of joins, Reduce-Side joins, Map-Side joins, and memory-backed Joins that can be used to join Tables in MapReduce. Map Side Join Joining at the map side…