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Hadoop On Demand (HOD) is a package that provides virtual map/red clusters on top of a larger HDFS installation. It is used extensively inside of Yahoo. The use of HOD requires an understanding of torque: http://www.clusterresources.com/pages/products/torque-resource-manager.php. The author and the team the author was working with found it too complex for the benefits provided and discontinued using it. HOD is described on the Hadoop site: http://hadoop.apache.org/core/docs/r0.19.1/ hod_user_guide.html. HOD has probably improved significantly because the author used it last with Hadoop 0.16.1. The author recommends avoiding HOD unless there is a local torque expert to handle the torque installation and day-to-day operation.

<ul id="second"> <li>Item A</li> <li>Item B</li> <li>Item C</li> </ul> Unlike all other methods so far, adopt allows for several elements at once, so passing an Elements instance will not result in an error. It does not support where arguments, but it can take more than one argument. This allows us, for example, to move items from several places instantly: <ul id="first"> <li>Item A</li> <li>Item B</li> <li>Item C</li> </ul> <ul id="second"> <li>Item D</li> <li id="itemE">Item E</li> </ul> <ul id="third"> <li>Item F</li> <li>Item G</li> </ul> <ul id="final"> </ul> We want to move all list items from the first and third lists into the final list and we also want to move the list item with the id itemE to the final list. We can do this quickly using adopt: var firstItems = $('first').getElements('li'); var thirdItems = $('third').getElements('li'); $('final').adopt(firstItems, thirdItems, $('itemE')); And here s the result: <ul id="first"> </ul> <ul id="second"> <li>Item D</li> </ul> <ul id="third"> </ul> <ul id="final"> <li>Item A</li> <li>Item B</li> <li>Item C</li> <li>Item F</li> <li>Item G</li>

public String getSessionId()

<li id="itemE">Item E</li> </ul> With a single adopt call, we were able to move several elements from different sources at once. This makes adopt ideal for multiple transfers between elements.

Display On the Display tab are, amazingly, a number of options affecting how the control and its contents are displayed. The Placeholder option puts placeholder text in a control, which can give some quick contextual guidance to a user. Read-only, as indicated, prevents a user from editing a control. You may often use this on calculated controls (e.g., your subtotal and grand total fields in Exercise 3-2) so that the user doesn t change the calculated totals. Enable Spelling Checker and Enable AutoComplete give you control over when these fields may not make sense (e.g., disable spell checking on proper name fields, and disable auto-complete on fields that may have sensitive or often-changing data). Checking the Multi-line option gives you the option to make a multi-line text box. Simply check multi-line and wrap text, and then size the text box larger vertically to get multi-line capability. Checking Paragraph breaks also gives a paragraph formatting style to the text box. The Limit text box to [x] characters option gives you a way to put a maximum length on a field. As indicated by the tab name, this only affects the display of the data, not the underlying schema. If you set this option, you also have the option to automatically skip to the next control when the control is full. Alignment lets you set the alignment of the text within the text box (left, center, right, or justified). Conditional Formatting Conditional formatting applies conditions to the control itself based on the contents. If you click the Conditional Formatting button, you will get the Conditional Formatting dialog, which is simply a container for your formatting rules. Click the Add button to bring up the Conditional Format rule dialog (Figure 3-25).

This method looks up the value of the key session.id in the configuration and returns it. If the value is unset, an empty String is returned. This is primarily used by HOD to distinguish different virtual clusters. The session name may also help distinguish this job in the metrics reporting framework.

Note The adopt method isn t just fast in terms of code: it s also fast internally because it uses a special DOM feature called document fragments. A document fragment is like a mini DOM Tree that can be used to store elements prior to inserting them into the DOM. The amazing thing about this feature is that a fragment can be inserted directly into the DOM without having to loop through its contents. This makes for very fast inserts something that's important for large element collections.

public void setSessionId(String sessionId)

This method stores sessionId in the configuration under the key session.id. This value will be used as a token in the name used to identify any metrics that are reported by this job. This method is primarily intended for use by HOD.

Web Service Description Language (WSDL)

Aside from moving them around, another common operation on elements is modifying their attributes and styles. MooTools provides both separate and unified APIs for these processes, and we ll look at the methods from these APIs one by one.