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Load balancers distribute web traffic among web servers. There are other kinds of load balancers for distributing other resources, such as hard disks and databases, but here, I m just talking about distributing HTTP requests. In the case of multiple web servers, load balancers allow web services to continue in the face of one web server s downtime or maintenance. There are two broad categories of load balancers. Software load balancers are cheaper or even free but tend to have more ongoing maintenance and administrative costs than hardware load balancers. Linux Virtual Server (www.linuxvirtualserver.org/) is one of the most popular Linux load balancers. Hardware load balancers are expensive, since they contain more advanced server switching algorithms, and tend to be more reliable than software-based solutions. In addition to load balancing, multiple web servers introduce several complications, primarily file uploading and keeping the code base consistent across servers.

prototype of an object will affect all future instances of that object, rather than just the current instance. For more information on this, check out the brief and simple explanation of the prototype object in JavaScript at http://www.javascriptkit.com/javatutors/proto.shtml.

When Drupal is run on a single web server, uploaded files are typically stored in Drupal s files directory. The location is configurable at Configuration -> File system. With multiple web servers, the following scenario must be avoided: 1. 2. A user uploads a file on web server A; the database is updated to reflect this. A user views a page on web server B that references the new file. File not found!

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You might notice that we ve ignored the name attribute of Shape. Normally, you would copy this property from the source to the target as well, but we ve done nothing with the name attribute in the Shapes application. We never added it to the Shape custom class, and we haven t added any code that would fill that value, so we left it out here to illustrate a point: if you leave an attribute out of a mapping policy, that attribute won t be copied over and will be blank in the target entity. Notice also that we didn t copy over the canvases relationships. The relationships are copied over by default in NSEntityMigrationPolicy s createRelationshipsForDestinationInstance: method. By not overriding that method, we get Core Data to copy those over for us. Now, you re ready to create the entity mapping between Circle and Ellipse. With your mapping model (Model4to5.xcmappingmodel) selected, click the + button below the Entity Mappings section on the left. Name the new entity mapping CircleToEllipse and

Tip Best practice is to use a distributed, replicating, high-availability file system like GlusterFS or AndrewFS. Rsync gets totally out of hand with more than two web servers and NFS is not high-availability, so both end up being poor recommendations for real production sites.

set its Source to Circle, its Destination to Ellipse, and its Custom Policy to CircleToEllipseMigrationPolicy. See Figure 8-11.

The plugin you ll build in this section will rely on a simple method to enlarge the event titles when a user hovers over them, and then return them to their original size when the user moves his mouse off the title. This plugin will be called dateZoom, and it will allow the user to configure the size, speed, and easing equation used for the animation.

Rather than synchronize multiple web servers, you can deploy a shared, mounted file system, which stores files in a single location on a file server. The web servers can then mount the file server using a protocol like GFS, AFS, or NFS. The advantages of this approach are that cheap additional web servers can be easily added, and resources can be concentrated in a heavy-duty file server with a redundant storage system like RAID 5. The main disadvantage to this system is that there is a single point of failure;

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