Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text are shown as follows: "The FileInputFormat subclass and associated classes are commonly used for jobs taking inputs from HFDS."

A block of code is set as follows:

return new CombineFileRecordReader<LongWritable, Text>((CombineFileSplit) inputSplit, taskAttemptContext,MasteringHadoopCombineFileRecordReader.class);
}

Any command-line input or output is written as follows:

14/04/10 07:50:03 INFO input.FileInputFormat: Total input paths to process : 441

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "The former is called a Map-side join and the latter is called a Reduce-side join."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.