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Insert DynamoDB Items with DynamoDBMapper


In a previous post we used DynamoDBMapper in order to map DynamoDB Tables into Java objects. When it comes to insert, our actions are pretty much the same but with a more convenient way. In order to insert an item all you have to do is to persist an object using the object mapper In our case, we will create ...

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How to Guide: Getting Started with Apache Drill


Apache Drill is an engine that can connect to many different data sources, and provide a SQL interface to them. It’s not just a wanna-be SQL interface that trips over at anything complex – it’s a hugely functional one including support for many built in functions as well as windowing functions. Whilst it can connect to standard data sources that ...

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Map DynamoDB Items to Objects using DynamoDB mapper


Previously we created DynamoDB Tables using Java. For various databases such sql databases or nosql there is a set of tools that help to access, persist, and manage data between objects/classes and the underlying database. For example for SQL databases we use JPA, for Cassandra we use MappingManager. DynamoDBMapper is a tool that enables you to access your data in ...

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Resource leakages: command pattern to the rescue


Over the years of performance monitoring with Plumbr I have faced hundreds of performance issues caused by resource leakages. In this post I would like to describe one of the simplest ways to approach resource clean-up and avoid the problem. Let me first describe the problem by using a movie player application as an example. The primary feature for such an ...

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Event Time in Apache Flink Stream Processing

In this week’s Whiteboard Walkthrough, Stephan Ewen, PMC member of Apache Flink and CTO of data Artisans, describes a valuable capability of Apache Flink stream processing: grouping events together that were observed to occur within a configurable window of time, the event time.                 For other related resources: Download the O’Reilly book Introduction to ...

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Authenticating with JGit

JGit is a lightweight, pure Java library implementing the Git version control system. You can do a lot of operations using Java language such as create or clone Git repos, create branches, make commits, rebase or tag, you can see this repo to learn how to use JGit and how to code the different commands. But one thing that does not ...

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An Introduction to CoreOS

If you’re reading this blog, then you have a rough idea of what containers are and why you want to use them. Docker has made it easy to experiment with containers, and is slowly making it easier to deploy and manage them in production environments. However, there are a still a lot of gaps in what Docker offers (for free), ...

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