Transparency in a Architecture Web environments

Architecture Web environments are some examples of how transparency works in distributed systems.

For example, when writing the name of a web page from your browser,the first thing that is done is to translate that name to an IP address,that IP address is where the information that you want to access fromthe Web browser is hosted. There are millions of IPs addresses and maychange frequently needed a large database distributed over severalnodes, which in turn each node is composed of several "machines" thatare able to maintain the data correctly and quickly resolve any domainname to an IP address. This work uses the so-called name server"Domain name system" (DNS).

We can see that the principle of transparency of location would be thesame regardless from where the user search for a web page.

Another example of transparency of replication also occurs when we access a web page that is replicated in a CDN, CDNS are geographicallydistributed servers that are responsible for replicating a web page to beclosest to the end user. How example, when we access a page in whichthe server is in Australia, requests and responses have to travel fromSpain to Australia and from Australia to Spain, which not only makes theloading time of a web page is larger, but that in addition we chargeconsiderably network since data have to make a much bigger journey.

To improve this the CDN (Content Delivery Network) are used, areresponsible for replicating the web in different geographically distributedservers that work as one, and when you request a web page from Spain,the CDN which is closer or less collapsed node will return content to theuser, so that navigation is smoother, getting a better experience for theuser.

Also in the CDN we see the principle of location transparency, since thesame web may be sent or accessed from various geographical pointsand the result of the submitted content will be the same for the enduser, regardless of where the user is the CDN.

We use the principle of transparency of audience, for example, when wemake a purchase via a digital supermarket that has a distributed systemto be able to make purchases online, and access your page, we purchase,and there is no problem because there are several users shopping at thesame store, i.e. programming we can have several "objects" without onemodify the data of another.

In the CDN or environments websites that use multiple servers, we cansee the principle of transparency of decisions, when one of the servers "isfallen" and you may not return the content and another server takesover sending the content to the user as if they were a single entity.

Scaling transparency manifests itself when we incorporate other serversto the network's content without that there is no stop service or noproblem, simply joins other machines that will help to alleviate theworkload of existing servers.