We learned a lot in this chapter about big data, Hadoop, and cloud computing.

Specifically, we covered the emergence of big data and how changes in the approach to data processing and system architecture bring within the reach of almost any organization techniques that were previously prohibitively expensive.

We also looked at the history of Hadoop and how it builds upon many of these trends to provide a flexible and powerful data processing platform that can scale to massive volumes. We also looked at how cloud computing provides another system architecture approach, one which exchanges large up-front costs and direct physical responsibility for a pay-as-you-go model and a reliance on the cloud provider for hardware provision, management and scaling. We also saw what Amazon Web Services is and how its Elastic MapReduce service utilizes other AWS services to provide Hadoop in the cloud.

We also discussed the aim of this book and its approach to exploration on both locally-managed and AWS-hosted Hadoop clusters.

Now that we've covered the basics and know where this technology is coming from and what its benefits are, we need to get our hands dirty and get things running, which is what we'll do in Chapter 2, Getting Hadoop Up and Running.