300 Questions for OREILLY DataBricks Apache Spark Developer Certification + 5 Page Revision notes

Question 3 : You have a website with millions of subscriber, and each subscriber can post 250 character message. As soon as message is posted an event is generated which will be sent over the JMS Queue. Now as an Spark expert you have decided to analyse this data in real time. Which spark component will help you to read the messages from queue in real time.

1.      Spark Core

2.      Spark SQL

3.      Spark Streaming

4.      MLlib

Correct Answer 3 : Exp : Spark Streaming is a Spark component that enables processing live streams of data. Examples of data streams include log files generated by production web servers, or queues of messages containing status updates posted by users of a web service. Spark Streaming provides an API for manipulating data streams that closely matches the Spark Core's RDD API, making it easy for programmers to learn the project and move between applications that manipulate data stored in memory, on disk, or arriving in real-time. Underneath its API, Spark Streaming was designed to provide the same degree of fault tolerance, throughput, and scalability that the Spark Core provides.

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