hadoop definitive guide 3rd edition

A function is a special object;Object: A collection of properties (name-value pairs);The function is used to initialize (with the new operator) a newly created object is called a constructor.The object is called as a method when the property is a function.Within a function body, a local variable takes precedence over a global variable of the same name.code example:varscope = "global"; // Declare a global variablefunctionCheckscope () {varScope = "local";//life a local variable with the same nam

GetCookie () function that resolves the value of the Document.cookie property, stores the corresponding name/value pair in an object, and returns the object at the end of the function.Parsing Document.cookie Property values/** returns the value of Document.cookie as an object of name/value pairs * Assuming that the value of the stored cookie is encoded with the encodeurlcomponent () function */function GetCookie () { var cookie = {}; Initialize the last object to

PDF version, English version 158th page,var IsArray = Function.isarray | | Function (o) {return typeof o = = = = "Object" object.prototype.tostring.call (o) = = = "[Object Array]";}; return typeof o = = = "Object" object.prototype.tostring.call (o) = = = "[Object Array]";};Array.isarray is a function provided by ES5, this example is to implement this function in ES3, first, if the browser supports Array.isarray, it is assigned to IsArray, otherwise the subsequent function is assigned to IsArray.

: The instance method of JS must use the This keyword, and the class's methods usually do not use the This keyword, they refer to its parameter operation;The P222-based inheritance mechanism in the extended p223js of class 9.4 is dynamic: Objects inherit properties from other prototypes, and if the properties of the prototype change after the object is created, it also affects all instance objects that inherit the prototype, and we can augment the JS class by adding a new method to the prototype

don't know if there's a remote that has failed, how to gracefully handle local failures, while still allowing the entire computation to move steadily forward.u) MapReduce is designed to run jobs that last minutes or hours on trusted, dedicated hardware running in a single data CE Nter with very high aggregate bandwidth interconnects.MapReduce is designed to operate in a single data center, made up of dedicated hardware that enables internal high-speed integration, to serve computing tasks that

Replacing elements with non-replacement elements - src = "test.jpg"/> !--- Spa> Hello World> SpaView CodeElement Display role CSS2.1 uses a different base element type, block-level (Block-level) elements, and inline (inline-level) elements - block-level elements generate an element box, (by default) it fills the content area of its parent element, and cannot have other elements next to it - P>P elementP> Div>div elementDiv> The inline element generates an element box

); path[] paths =NewPath[args.length]; for(inti =0; i NewPath (Args[i]); } filestatus[] status = Fs.liststatus (paths); path[] Listedpaths = fileutil.stat2paths (status); for(Path p:listedpaths) {System. out. println (P); } }}Z) rather than have to enumerate each file and directory to specify the input, it's convenient to use wildcard characte RS to match multiple files with a single expression, an operation, which is known as globbing. Hadoop