Administrative Notes

During discussion of a particular Java class in the text, I often omit its package name to reduce clutter. If you need to know which package a class is in, you can easily look it up in the Java API documentation for Hadoop (linked to from the Apache Hadoop home page), or the relevant project. Or if you’re using an integrated development environment (IDE), its auto-complete mechanism can help find what you’re looking for.

Similarly, although it deviates from usual style guidelines, program listings that import multiple classes from the same package may use the asterisk wildcard character to save space (for example, import org.apache.hadoop.io.*).

The sample programs in this book are available for download from the book’s website. You will also find instructions there for obtaining the datasets that are used in examples throughout the book, as well as further notes for running the programs in the book and links to updates, additional resources, and my blog.