Tutorials in ML, AWS, R and Java
Mithil Shah DynamoDB Basics DynamoDB Overview DynamoDb is an AWS managed NoSQL database. It offers the following: Encryption at rest Scale throughput without downtime On demand backup and point in time recovery Data stored in SSD and replicated accross multiple AZs. DynamoDB Components table –> items –> attributes DynamoDB tables table is a collection of data items. … Read more
In this article we will look at how to install Kubernetes on AWS using KOPS. We will build a 5 node cluster with 2 masters, 3 etcd nodes and 3 worker nodes. I have used ubuntu to do the installation (Ubuntu installed on a VirtualBox on a Windows Machine). If you download VirtualBox and install … Read more
In this article we will look at how to install Minikube and Docker with VirtualBox on Windows 10 Home Machine. We use VirtualBox since Hyper V is not installed by default on the Windows 10 Home edition and secondly VirtualBox makes it easy to run multiple VMs especially various linux versions and therefore we might … Read more
People often get confused when looking at the Docker architecture at what the various components do. In this article I will attempt to demystify a few components. The latest docker version when writing this article is 18.09. Here’s an overall hierarchy of Docker The heart of Docker is the docker engine. 1. Docker Engine The … Read more
Introduction to javadoc command The javadoc tool is used to create nicely formatted documents from java source code. The tool can be found in the bin directory of java . The tool uses a ‘doclet’ to convert java source code into a document. The standard doclet produces an HTML document but you can have doclets … Read more
What does the Java 9 JLink tool do The java 9 JLink tool enables you to create a runtime application by assembling a specific set of modules. With this tool, Java 9 now has the capability to create an application that works even if you don’t have the JRE installed. JLink creates a minimal JRE … Read more
Java 9 JShell Command line tool. The Java 9 JShell tool allows you to write and evaluate Java expressions, statements and declarations on the command line via an interactive tool. To start JShell type in ‘jshell’ on the command line. If that does not work, make sure you have installed JDK 9 or 10 and … Read more
The Java 9 project coin language changes include diamond with anonymous classes, private methods in interfaces, removing ‘_’ as a single character identifier, @SafeVargs on private instance methods and effectively final variables as resources in try-wth-resources statement. 1. Diamond with anonymous classes Prior to Java 1.6, constructors did not have inferred type inference. This code … Read more
What is the Stack Walking API The Java 9 Stack walking API provides an efficient way to walk the jvm stack. The existing methods Thread::getStackTrace() and Throwable::getStackTrace return an array of all stack frames and they do that by grabbing all the frames in the stack. This is performance intensive. The implementation is also allowed … Read more
In this tutorial we will cover the Java 9 enhancements to Stream and java.util.Arrays. The most important enhancements to stream are the takeWhile, dropWhile, ofNullable, and iterate methods. The enhancement to Arrays has been the new equals and mismatch method that allow comparing subset of arrays. We will look into the details of the new … Read more