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 URL for NameNode is http://<namenode_host>:<port>/ and the default HTTP port is 50070."

A block of code is set as follows:

    <property>  
     <name>io.file.buffer.size</name> 
     <value>4096</value>  
     <description>read and write buffer size of files</description>
    </property>

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

${path_to_your_input_dir}
${path_to_your_output_dir_old}

New terms and

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