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Microservice using AWS Serverless Application Model and Couchbase

Amazon Web Services introduced Serverless Application Model, or SAM, a couple of months ago. It defines simplified syntax for expressing serverless resources. SAM extends AWS CloudFormation to add support for API Gateway, AWS Lambda and Amazon DynamoDB. This blog will show how to create a simple microservice using SAM. Of course, we’ll use Couchbase instead of DynamoDB! This blog will also use the ...

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Monitoring Real-Time Uber Data Using Spark Machine Learning, Streaming, and the Kafka API (Part 2)

This post is the second part in a series where we will build a real-time example for analysis and monitoring of Uber car GPS trip data. If you have not already read the first part of this series, you should read that first. The first post discussed creating a machine learning model using Apache Spark’s K-means algorithm to cluster Uber data based ...

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Tuning PostgreSQL with pgbench

When it comes to performance tuning an environment, often the first place to start is with the database. The reason for this is that most applications rely very heavily on a database of some sort. Unfortunately, databases can be one of the most complex areas to tune. The reason I say that is because tuning a database service properly often ...

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Getting Started with MQTT and Java

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MQTT (MQ Telemetry Transport) is a lightweight publish/subscribe messaging protocol. MQTT is used a lot in the Internet of Things applications, since it has been designed to run on remote locations with system with small footprint. The MQTT 3.1 is an OASIS standard, and you can find all the information at http://mqtt.org/ This article will guide you into the various ...

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Connecting Pentaho Data Integration to MapR Using Apache Drill

Pentaho Data Integration (PDI) provides the ETL capabilities that facilitate the process of capturing, cleansing, and storing data. Its uniform and consistent format makes it accessible and relevant to end-users and IoT technologies. Apache Drill is a schema-free SQL-on-Hadoop engine that lets you run SQL queries against different data sets with various formats, e.g. JSON, CSV, Parquet, HBase, etc. By ...

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The important changes in the new ANTLR 4.6

After almost a year since the last major release, there is a new ANTLR version: 4.6. There are many news: new targets, better perfomance, better error handling and several improvements in the development of ANTLR itself. New targets The most impactful news is probably the new targets: C++, Go and Swift. Of course getting C++ support is a big deal. ...

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Deploying akka-http app to Cloud Foundry

It is easy to deploy an akka-http application to Cloud Foundry. I experimented with a few variations recently and will cover ways to deploy an Akka-http based REST app in two parts – first a simple app with no external resource dependencies, the second a little more complex CRUD app that maintains state in a MySQL database. Pre Requisites A quick way to ...

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Isolating the Domain Logic

In one design patterns class, I had an interesting discussion about modelling domain logic. Specifically, it was about isolating the domain logic. An application would typically be divided into three parts: Presentation (e.g. desktop GUI, browser, web service) Domain logic Infrastructure (e.g. persistence storage, e-mail) The class found it interesting that the dependency arrows were pointing towards the domain logic ...

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