Gorelik - The Enterprise Big Data Lake

by Alex Gorelik

Copyright 2019 Alex Gorelik. All rights reserved.

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978-1-491-93155-4

[LSI]

In recent years many enterprises have begun experimenting with using big data and cloud technologies to build data lakes and support data-driven culture and decision makingbut the projects often stall or fail because the approaches that worked at internet companies have to be adapted for the enterprise, and there is no comprehensive practical guide on how to successfully do that. I wrote this book with the hope of providing such a guide.

In my roles as executive at IBM and Informatica (major data technology vendors), Entrepreneur in Residence at Menlo Ventures (a leading VC firm), and founder and CTO of Waterline (a big data startup), Ive been fortunate to have had the opportunity to speak with hundreds of experts, visionaries, industry analysts, and hands-on practitioners about the challenges of building successful data lakes and creating a data-driven culture. This book is a synthesis of the themes and best practices that Ive encountered across industries (from social media to banking and government agencies) and roles (from chief data officers and other IT executives to data architects, data scientists, and business analysts).

Big data, data science, and analytics supporting data-driven decision making promise to bring unprecedented levels of insight and efficiency to everything from how we work with data to how we work with customers to the search for a cure for cancerbut data science and analytics depend on having access to historical data. In recognition of this, companies are deploying big data lakes to bring all their data together in one place and start saving history, so data scientists and analysts have access to the information they need to enable data-driven decision making. Enterprise big data lakes bridge the gap between the freewheeling culture of modern internet companies, where data is core to all practices, everyone is an analyst, and most people can code and roll their own data sets, and enterprise data warehouses, where data is a precious commodity, carefully tended to by professional IT personnel and provisioned in the form of carefully prepared reports and analytic data sets.

To be successful, enterprise data lakes must provide three new capabilities:

• Cost-effective, scalable storage and computing, so large amounts of data can be stored and analyzed without incurring prohibitive computational costs

• Cost-effective data access and governance, so everyone can find and use the right data without incurring expensive human costs associated with programming and manual ad hoc data acquisition

• Tiered, governed access, so different levels of data can be available to different users based on their needs and skill levels and applicable data governance policies

Hadoop, Spark, NoSQL databases, and elastic cloudbased systems are exciting new technologies that deliver on the first promise of cost-effective, scalable storage and computing. While they are still maturing and face some of the challenges inherent to any new technology, they are rapidly stabilizing and becoming mainstream. However, these powerful enabling technologies do not deliver on the other two promises of cost-effective and tiered data access. So, as enterprises create large clusters and ingest vast amounts of data, they find that instead of a data lake, they end up with a data swampa large repository of unusable data sets that are impossible to navigate or make sense of, and too dangerous to rely on for any decisions.

This book guides readers through the considerations and best practices of delivering on all the promises of the big data lake. It discusses various approaches to starting and growing a data lake, including data puddles (analytical sandboxes) and data ponds (big data warehouses), as well as building data lakes from scratch. It explores the pros and cons of different data lake architectureson premises, cloud-based, and virtualand covers setting up different zones to house everything from raw, untreated data to carefully managed and summarized data, and governing access to those zones. It explains how to enable self-service so that users can find, understand, and provision data themselves; how to provide different interfaces to users with different skill levels; and how to do all of that in compliance with enterprise data governance policies.