Conventions

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

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "The PATH variable should have the path to Python installation on your machine."

A block of code is set as follows:

public class Count implements CombinerAggregator<Long> {
   @Override
   public Long init(TridentTuple tuple) {
      return 1L;
   }

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

> bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "The landing page on Storm UI first talks about Cluster Summary."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.