Data Science Chapter 2

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10 Questions

What is the primary function of Sqoop in the Hadoop ecosystem?

Transferring data from RDBMS to HDFS

Which of the following tools is not used for data analysis in Hadoop?

Flume

What is the primary function of Zookeeper in the Hadoop ecosystem?

Managing clusters in Hadoop

In which stage of the Big Data life cycle is data stored and processed?

Processing

Which of the following is not a component of the Hadoop ecosystem?

Spark

What is the purpose of the Oozie component in the Hadoop ecosystem?

Scheduling jobs in Hadoop

In the Big Data life cycle, what is the primary function of the Ingest stage?

Transferring data from various sources to Hadoop

Which of the following tools is used for providing access to analyzed data in Hadoop?

Hue

What is the primary function of Flume in the Hadoop ecosystem?

Transferring event data from social media platforms

What is the primary function of MAHOUT in the Hadoop ecosystem?

Providing various functionalities for collaborative filtering, clustering, and classification

Study Notes

Introduction to Data Science

  • Data science is a multidisciplinary field that uses scientific methods, processes, algorithms, and systems to extract knowledge and insights from data.
  • The main purpose of data science is to find patterns within data and use several techniques to analyze and draw perceptions from data.
  • Data scientist is responsible for making predictions from data and providing insights to decision-makers.

Data Processing Cycle

  • Data processing is the re-structuring or re-ordering of data by people or machines to increase their usefulness and add value for a particular purpose.
  • Three steps constitute the data processing cycle: input, processing, and output.
  • Input: preparing data in a convenient form for processing.
  • Processing: changing input data to produce data in a more useful form.
  • Output: collecting the result of the processing step.

Data Types

  • Unstructured data: data that is not organized in a pre-defined manner or does not have a pre-defined data structure (e.g., audio, video files, music).
  • Metadata: data about data, which provides additional information about a specific set of data (e.g., when and where photos were taken).

Data Value Chain

  • The data value chain describes the information flow within a big data system as a series of steps needed to generate value and useful insights from data.
  • Key high-level activities in the data value chain include data acquisition, data processing, data analysis, and data visualization.

Big Data

  • Big Data refers to a collection of data that is huge in volume, velocity, variety, and veracity.
  • 4Vs of Big Data: volume, velocity, variety, and veracity.
  • Big Data is used for analysis to get insights that help with business decisions.

Big Data Life Cycle with Hadoop

  • Ingesting data into the system: transferring data from various sources to Hadoop.
  • Processing: storing and processing data in HDFS and HBase using Spark and MapReduce.
  • Analyzing: analyzing data using processing frameworks such as Pig, Hive, and Impala.
  • Access: accessing analyzed data using tools such as Hue and Cloudera Search.

Hadoop Ecosystem

  • Sqoop: transferring data from RDBMS to HDFS.
  • Flume: transferring event data such as social media data, clickstreams, etc.
  • Oozie: job scheduling.
  • Zookeeper: managing clusters.
  • Lucene: searching and indexing.
  • Solar: searching and indexing.
  • Mahout: providing various functionalities such as collaborative filtering, clustering, and classification.

Test your understanding of data science fundamentals, including the role of data scientists, data processing life cycle, data types, and the basics of Big Data and Hadoop ecosystem components. This quiz covers the key concepts introduced in Chapter 2 of a data science course.

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