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This method looks up the key mapred.job.queue.name in the configuration and returns the value. If the value is unset, default is returned. Queues, which are new to Hadoop 0.19.0, provide a mechanism to allow multiple jobs to share cluster resources in a specified manner (refer to 8).

These four specifications together with the dozen others that are currently being discussed form the core set of APIs that all CommonJS-compliant engines support. In addition to the specifications themselves, the CommonJS group is responsible for another important effect the development of several powerful implementations that are compliant with these specifications. There are now more than a dozen implementations available, each created using the original open-source interpreter from popular browsers such as Mozilla s SpiderMonkey and Rhino engines, and Google s v8 engine. This enables a multitude of platform possibilities for JavaScript development outside the browser.

The custom class must also have a default constructor, even if you don t plan to use one. If you don t Tip

public void setQueueName(String queueName)

Perhaps the most important specification to come out of CommonJS is Modules. This specification is one of the first efforts of the group to be widely accepted, and it has gained support in all CommonJS engines as well as in other platforms both inside and outside the browser. The Modules specification the current version is 1.1 describes a working system for creating and reusing JavaScript modules. At its center is the concept of a module, a group of related JavaScript functionalities that can be imported into CommonJS programs for reuse. For the most part, an implementation of the Modules specification is the only requirement a platform needs in order to be called CommonJS-compliant. Any platform from standalone JavaScript engines to fully-fledged application frameworks can therefore be considered a CommonJS engine if it enables the use of CommonJS Modules. As such, the Modules specification plays an important role in the CommonJS ecosystem for determining which implementations can be compatible with the CommonJS philosophy.

This method stores queueName in the configuration under the key mapred.job.queue.name. If queueName is not a valid queue name, the JobTracker behavior is unpredictable.

have a default (parameterless) constructor, an error will be thrown when you try to load the test harness.

To understand how the Modules specification and thus the module system of all CommonJScompliant engines works, we ll have to implement a basic module. Let s take a module composed of some math-related functions. var sum = function(a, b){ return a + b; }; var increment = function(num){ return sum(num, 1); }; Here we have two simple functions, sum and increment, which we d like to turn into a CommonJS module. In the CommonJS specification, a module is simply a file with the name of the module as the file name, followed by the file extension .js. What we want is a math module, so we ll name our file math.js: // math.js var sum = function(a, b){ return a + b; }; var increment = function(num){ return sum(num, 1); }; Now we have a file called math.js, which includes our two math functions. However, we still don t have a module. To create a module, we have to define the things a module provides. A module is said to provide something if by importing the module, we can access that functionality. In our math example, we want importers of our module to be able to access the two functions. To do this, we have to use a special object called exports: // math.js var sum = function(a, b){ return a + b; };