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, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "This includes information about the location of the .META. table."

A block of code is set as follows:

Configuration conf = HBaseConfiguration.create();
HTable table = new HTable(conf, "logtable");
Scan scan = new Scan();
scan.setMaxVersions(2);
ResultScanner result = table.getScanner(scan);
for (Result result: scanner) {
    System.out.println("Rows which were scanned : " + Bytes.toString(result.getRow()));
}

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

sudo yum clean all;
sudo yum install hadoop-hdfs-namenode
sudo yum install hadoop-hdfs-secondarynamenode
sudo yum install hadoop-0.20-mapreduce-tasktrackerhadoop-hdfs-datanode
sudo yum install hbase

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: "In the Network Connections window, click on Edit... and enter the information accordingly."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.