The Spark web framework promises to make distributed data management more efficient. The Heroku service facilitates testing and deploying your apps. Put the two together, and you get app development at Internet speed.
It didn't take long for the Spark web framework for distributed data management to capture the attention of app developers. Spark was originally conceived as a way to offer "a simple API for distributed data processing in general-purpose programming languages (Java, Python, Scala)," as Reynold Xin explains in a March 26, 2015, post on Opensource.com.
To date, Spark is known primarily as a faster, simpler, and more efficient alternative to Hadoop's MapReduce. In a March 17, 2015, article in InfoWorld, Platfora executive Peter Schlampp writes that MapReduce can be difficult to use even for data scientists. By contrast, Spark features a tool for accelerated queries, a machine learning library, a graph processing engine, a streaming analytics engine, and other advanced analytics "right out of the box."
Xin credits the Spark API's functional transformations on distributed collections of data, or Resilient Distributed Datasets (RDDs), as the reason the framework can express tasks in dozens of lines of code that previously required thousands of lines. In an attempt to deliver the power of distributed processing to a wider audience, a new DataFrame API has been created for Spark as an extension to the original RDD API.
DataFrames are able to scale from kilobytes of data on a single PC to petabytes in a large cluster. They support many different data formats and storage systems, and they feature APIs for Java, Python, and Scala, with an API for R in development via SparkR. The Spark SQL Catalyst optimizer delivers state-of-the-art code generation and optimization.
This example illustrates how to use DataFrames to manipulate the demographic data of a large group of users. Source: Opensource.com
Teaming Spark and Heroku to simplify and speed up Java app development
In an attempt to take some of the sting out of developing and testing Java apps, Arjun Surendra created a tutorial that demonstrates how to use Heroku to develop and deploy a Java app to the Internet in under five minutes. Surendra uses the netbeans API, but the technique works with any IDE or text editor. It requires JDK7 in addition to Spark.
You start by creating a simple Java Maven project that includes App.java, home.ftl.html, login.ftl.html, log4j.properties, pom.xml, and system.properties. Finally, you add the Procfile.
Developing and deploying a Java app to the Internet via Heroku uses a straightforward Procfile. Source: Arjun Surendra
Once you're ready to deploy the app to Heroku, the Heroku tool belt installs the required git version control. You then create the Heroku repository, enter your Heroku credentials, and push the code to the Heroku owned git repo, where it is built and deployed automatically.
The Heroku Dev Center provides information on using Heroku with Spring MVC Hibernate, as well as with the Play Framework, and with Node.js. Another useful resource is the Java on Heroku Forum, which includes a post describing how to troubleshoot application errors related to Procfile, system.properties, pom.xml, and other project components.
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