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Hadoop Core is designed to take advantage of commodity hardware, rather than more expensive specialpurpose hardware. In my experience, the bulk of custom-purchased Hadoop nodes appear to be 2U 8-way machines, with six internal drive bays, two Gigabit Ethernet (GigE) interfaces, and 8GB of RAM. Most of the disk drives that are being used for Hadoop are inexpensive SATA drives that generally have a sustained sequential transfer rate of about 70Mbps. The RAID setup preferred by my IT department groups six of these drives in a RAID 5 array that provides roughly 250 Mbps sequential transfers to the application layer. Mixed read/write operations provide about 100 Mbps, as all I/O operations require seeks on the same set of drives. If the six drives were provided as individual drives or as three RAID 0 pairs, the mixed read/write I/O transfer rate would be higher, as seeks for each I/O operation could occur on different drives. The common network infrastructure is GigE network cards on a GigE switch, providing roughly 100 Mbps I/O. I ve used bonded pairs of GigE cards to provide 200 Mbps I/O for high-demand DataNodes to good effect. IT departments seem to prefer large managed switches, resulting in a high per-port cost. For Hadoop nodes, providing dumb, unmanaged crossbar switches for the DataNodes is ideal.

charge: function(){ new ElectricalSocket().connect(this); } }); var Phone = new Class({ Implements: [Ringer, Charger], initialize: function(number){ this.number = number; this.sound = 'phone.ogg'; }, call: function(from){ this.ring(); new Notification('New call!'); } }); var phone = new Phone(0000); console.log(typeof phone.ring); // 'function' console.log(typeof phone.charge); // 'function' Mixins are actual classes, but they re usually written without an initialize method since they re not meant to be used like regular classes. Rather, mixins are considered to be collections of properties and methods that will be added to other classes, and they provide a simple way to share and reuse code among many classes. The Implements keyword should give you a clue as to how mixins are added to classes. When the implement method sees this keyword, it creates new instances of these classes that are then fed to another implement call. This process adds the members of the instance that are inherited from the mixin class to the class itself. Without using the Implements keyword, we could mimic this process by using implement directly: var Ringer = new Class({ sound: 'ring.ogg', ring: function(sound){ sound = sound || this.sound; new Sound(sound).play(); } }); var Phone = new Class({ initialize: function(number){ this.number = number; this.sound = 'phone.ogg'; },

Setting up an HDFS installation for a multimachine cluster involves the following steps: Build the configuration. Distribute your installation data to all of the machines that will host HDFS servers. Format your HDFS. Start your HDFS installation. Verify HDFS is running. The following sections detail these steps.

call: function(from){ this.ring(); new Notification('New call!' + this.from); } }); Phone.implement(new Ringer); This snippet shows exactly how mixins were done in older versions of MooTools. You shouldn t do this with the current versions, though, since it s verbose and hard to read. You should declare your mixins using Implements in your class declaration for readability. One cool thing about mixins, though, is that the parent method respects their previous prototype chain rather than their new one. What this means is that when the parent method is called from within a method in a mixin that has been added to a class, the method will call the corrresponding overriden method in the mixin s original prototype chain: var MixinSuper = new Class({ log: function(){ console.log('MixinSuper'); } }); var Mixin = new Class({ Extends: MixinSuper log: function(){ this.parent(); } }); var Super = new Class({ log: function(){ console.log('Super'); } }); var Sub = new Class({ Extends: Super, Implements: Mixin }); new Sub().log(); // 'MixinSuper'

InfoPath 2007, in combination with Office SharePoint Server 2007, allows you to author forms that can be served to a web browser (see Figure 3-2). The forms have full fidelity with the rich client forms including drop-down lists, optional and repeating sections, rich text, and validation with a minimum of round trips to the server. Browser-based forms are compatible with Internet Explorer (IE) 5+, Netscape 6+, Firefox, Safari, and Mozilla, providing a cross-platform capability not previously available with InfoPath forms. There are a number of features that are not available in browser forms. Obviously, inking controls are not, nor are image controls, combo boxes, master/detail controls, or lists. The best way to approach this is to create a form as a browser form from scratch; by indicating the form is browser-based, only those options permitted in browser forms will be available. Should you decide to change once a form is designed, then you can use the design checker in the Design Tasks pane to validate the suitability of a form for browser use. One other option to note with respect to the limitations of browser forms is that it is possible to designate a view as client-only. If you do so, the view will not be available to browser form users, and the full InfoPath client capabilities will be available in that view.