Agile Data Science by Russell Jurney.
From the preface:
I wrote this book to get over a failed project and to ensure that others do not repeat my mistakes. In this book, I draw from and reflect upon my experience building analytics applications at two Hadoop shops.
Agile Data Science has three goals: to provide a how-to guide for building analyticsapplications with big data using Hadoop; to help teams collaborate on big data projectsin an agile manner; and to give structure to the practice of applying Agile Big Data analytics in a way that advances the field.
From 2013 and data science has moved quite a bit in the meantime but the principles Russell illustrates remain sound and people do still use Hadoop.
Depending on what you gave up for Lent, you should have enough non-work time to work through Agile Data Science by the end of Lent.
Maybe this year you will have something to show for the forty days of Lent. 😉