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Instant MapReduce Patterns – Hadoop Essentials How-to by Srinath Perera

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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: " Verify the installation by listing processes through the ps | grep java command."

A block of code is set as follows:

public void map(Object key, Text value, Context context) {
    StringTokenizeritr = new   
        StringTokenizer(value.toString());
    while (itr.hasMoreTokens()) {
       word.set(itr.nextToken());
       context.write(word, one);
    }
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

job.setOutputKeyClass(Text.class); job.setOutputValueClass(IntWritable.class); ...

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