There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "The results are stored in HDFS under the /user/cloudera/output."

A block of code is set as follows:

   "_id" : ObjectId("597cdbb193acc5c362e7ae97"), 
   "firstName" : "Nina", 
   "age" : 53, 
   "frequentFlyer" : [ 
          "Delta", 
          "JetBlue", 
          "Delta" 

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

$ cd Downloads/ # cd to the folder where you have downloaded the zip file 

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "This sort of additional overhead can easily be alleviated by using virtual machines (VMs)"