Reading Time: 4 minutes The term Big Data has created a lot of hype already in the business world. Hadoop and Spark are both Big Data frameworks – they provide some of the most popular tools used to carry out common Big Data-related tasks. In this blog, we will cover what is the difference between Apache Hadoop and Apache Spark MapReduce. Introduction Spark – It is an open source Continue Reading
Reading Time: < 1 minute Hi all, Knoldus has organized a 1-hour session on 8th September 2017. The topic was “Getting started with Presto”. Many people have joined and enjoyed the session. I am going to share the slides here. Please let me know if you have any question related to linked slides or video. The slides of the Knolx are here: And Here’s the video of the session: For any Continue Reading
Reading Time: 2 minutes Apache recently released a newer version of Spark i.e Apache Spark 2.2. The new version comes with new improvements as well as the addition of new functionalities. The major addition to this release is Structured Streaming. It has been marked as production ready and its experimental tag has been removed. Some of the high-level changes and improvements : Production ready Structured Streaming Expanding SQL functionalities New Continue Reading
Reading Time: < 1 minute Actions in Play Framework plays an important, the requests received by a Play application are handled by an Action. Action composition is an incredibly powerful way to enhance or restrict controller behaviour. In Play Framework controllers consist of methods that create Action objects to handle the incoming requests. A play.api.mvc.Action is basically a (play.api.mvc.Request => play.api.mvc.Result) function that handles a request and generates a result to be sent to the client. We can Continue Reading
Reading Time: 3 minutes Hi Guys, In today’s blog we’ll be discussing about ReactiveMongo. It is a Scala driver that provides fully non-blocking and asynchronous I/O operation. It is designed to avoid any kind of blocking request to your database. Every operation returns immediately, freeing the running thread and resuming execution when it is over. Before starting using reactive mongo, one should have an understanding about mongoDb. So let’s Continue Reading
Reading Time: 2 minutes Hi Guys, In this blog we’ll be discussing about how to make a connection to presto server using JDBC, but before we get started let’s discuss what Presto is. What is Presto ? So, Presto is an open source distributed SQL query engine for running interactive analytic queries against different data sources. The sizes may ranges from gigabytes to petabytes. It runs on a cluster Continue Reading
Reading Time: 2 minutes Hi all, In this blog, we’ll be discussing on fetching data from different sources using Spark 2.1 like csv, json, text and parquet files. So first of all let’s discuss what’s new in Spark 2.1. In previous versions of Spark, you had to create a SparkConf and SparkContext to interact with Spark whereas in Spark 2.1 the same effects can be achieved through SparkSession, without explicitly Continue Reading
Reading Time: 2 minutes Markdown is a lightweight markup language with plain text formatting syntax designed so that it can be converted to HTML and many other formats using a tool by the same name. It is often used to format readme, for writing messages in online discussion forums, and to create rich text using a plain text editor. So, here is a quick introduction to some of the elements of Continue Reading
Reading Time: < 1 minute Hi guys, Knoldus organized a knolx session on the topic : Realm Mobile Database. A better mobile database means better apps. Realm is a mobile database that runs directly inside phones, tablets or wearables. It saves data in minutes so you can build mobile apps in a fraction of time. It is a simple alternative to SQLite and Core Data. It works on all major Continue Reading
Reading Time: 6 minutes Today, most security breaches online occur through the application rather than the server. The majority of web application attacks occur through cross-site scripting (XSS) and SQL injection attacks which typically result from flawed coding, and failure to sanitize input to and output from the web application. In this blog I will be discussing these two attacks and methods on how to counter them. Cross Site Continue Reading
