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: "Aggregate function can be used with other aggregate functions in the same select statement."

A block of code is set as follows:

<property>
  <name>javax.jdo.option.ConnectionURL</name>
  <value>jdbc:mysql://myhost:3306/hive?createDatabase IfNotExist=true</value>
  <description>JDBC connect string for a JDBC metastore</description>
</property>

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

customAuthenticator.java
package com.packtpub.hive.essentials.hiveudf;

import java.util.Hashtable;
import javax.security.sasl.AuthenticationException;
import org.apache.hive.service.auth.PasswdAuthenticationProvider;

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

bash-4.1$ hdfs dfs –mkdir /tmp

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: "Click on the OK button and restart Oracle SQL Developer."