spark transformations

Spark Transformations

Spark

Table of Contents1. OverviewNarrow Transformationmap()filter()flatMap()union()Wide TransformationsreduceByKey()Associativity 1. Overview In one of our previous article, we have explained Spark RDD example, in this article we are going to explain Spark Transformations….

Java Multikey map example

Java Multikey map example

Java Basic

Table of Contents1. Overview2. Examples of Java MultiKeyMap2.1 Add elements to multikey Map2.2 Remove element from MultiKeyMap2.3 MultiKeymap Iteration3. Conclusion 1. Overview This article is about how to java multikey…

Spring JPA order by query

Spring JPA order by query

Spring Boot

Table of Contents1. Overview2. Sorting/Order by query examples2.1 Static sorting2.2 Dynamic sorting based on parameters2.3 Order By with JpaSpecificationExecutor3. Conclusion4. References 1. Overview This article is about Spring JPA order…

Spring Jackson enable pretty Json

Spring Jackson enable pretty Json

Spring Boot

Table of Contents1. Overview2. Ways to enable Jackson pretty/readable Json1. application.properties2. Bean configuration3. Concussion 1. Overview This article is about sping Jackson enable pretty Json or enable readable Json format….

Java regular expression username

Java regular expression for username

Java 8

Table of Contents1. Overview2. Rules for username3. Regex for user name – ^([a-zA-Z])+([\\w]{2,})+$3. Conclusion4. Source Code5. References 1. Overview This article is about for Java Regular Expression for username. While…