One of the most popular themes in the last couple years on the web is the much-heralded “cloud computing”. Of course, the cloud metaphor is taken from the representation of the Internet in architecture diagrams as a big fluffy cloud to which other, more discrete networks and systems are interconnected. From the Wikipedia page, Cloud computing, defined, is:
a style of computing in which IT-related capabilities are provided “as a serviceâ€, allowing users to access technology-enabled services from the Internet (“in the cloud”) without knowledge of, expertise with, or control over the technology infrastructure that supports them.
Google popularized dynamic web-based applications that behaved much like desktop apps, and essentially ushered in the era of what we fondly (sometimes snidely) call “Web 2.0”. In the short span of 3 or 4 years (I’m counting since 2005, when the web community at large became aware of Ajax and similar technology), dynamic web applications have become the de facto UI for end-user interactive software offerings — if it makes sense to use the ubiquitous browser as the frontend, then why not? Instead of forcing users to install, configure, and learn yet another new desktop app, give them an interface with which they’re already comfortable and familiar. As an added benefit, the browser interface is supported on nearly every operating system and platform used today (proprietary plugins and extensions notwithstanding).
Since then, the “cloud” has been touted as the next generation of the web, and as a concept encompasses a few key areas:
Large vendors with existing market plays involving huge server farms and data centers are eagerly jumping on the bandwagon — like IBM, Google, Amazon, Sun, etc. Software vendors are touting their existing and upcoming apps as “cloud” initiatives. The previously mentioned firms, as well as Salesforce, Zimbra (now owned by Yahoo), Zoho, and a multitude of other startups are all rushing to lay claim to a piece of land in the Cloud Gold Rush. Even Microsoft, notoriously late to the web party, instead relying on its stalwart cash cows of Windows and Office, has made its own bid in the cloud wars with Mesh and announcements of a web version of Office.
Cloud computing promises to change much of how we as developers, designers, and architects currently design and build web applications. For one, concurrency is big issue that need to be addressed if the apps of the next decade are going to scale on this cloud infrastructure. Languages, platforms, and tools need to provide solutions for creating apps that scale efficiently on multiple cores, processors, and even systems. Architects will have to design solutions that are massively scalable and take advantage of the properties of the cloud. UI specialists and designers will work with browser-based frontends, as well as newer mobile phone interfaces and Internet-enabled devices (such as Nokia’s Maemo Internet tablet).
I envision a future beyond the current cloud computing craze, perhaps in 5 – 10 years, where computing is a utility service just like power and telephone service are today. Several companies, including Amazon and Sun, are already offering some utility-style services, and many distributed computing projects tackling specific problems run on volunteer end-user systems today, but I’m thinking of something much broader. Instead of vendor-specific mini-clouds or utility services, we should aim for what I’ll term universal utility computing (UUC), built on open protocols and standards.
Essentially, the idea is to ensure every node in the cloud is an active member. By “active”, I mean the resources of every device are available for use by others. Computing cycles can be used (when idle, or up to a certain configurable threshold percentage of total CPU), storage, etc. It’s similar in nature to a grid and distributed computing, but utilizing a general, Internet-wide approach.
So how would such a system work? For starters, a UUC protocol would be required, and agent software written for various operating systems. The protocol would specify the sequence of communication between nodes, allowing true peer-to-peer messaging. The agent would ideally sit in the kernel space, interacting with the built-in scheduler, hardware abstraction layer, and storage subsystem.
Once a device has been “UUC-enabled”, it could begin to participate in the utility cloud. Every system in the cloud would share its resources for utility computing. Applications would then have the ability to harness as much computing power as required. Nodes that didn’t participate in the utility cloud couldn’t take advantage of utility resources.
Imagine all mobile phones on Earth utilizing a small portion of their resources in protein folding computations, or all servers processing climate forecasting data, or molecular level interactions for medical applications. Internet-enabled gaming consoles, tablets, laptops, desktops, and a plethora of devices that may be idle 90% of the time can now be used for computation. Imagine if the machines available to the average botnet hacker could be used for helpful purposes instead of spam.
Naturally, there are several challenges that must be overcome. Security and privacy, as today, would have to be addressed, employing encryption and other techniques to ensure confidentiality and integrity. Outside of individual nodes, there must be built-in mechanisms for preventing DDOS-style attacks, as well as preventing malicious users from exhausting the available utility-dedicated resources on one or several devices. There must also be a system used to prioritize workloads sent to the cloud, and a way to adjust the priority of a task. Checks and balances could be automatic, ensuring that a particular workload doesn’t use more than pre-determined slice of the available resources for a system.
Universal utility computing could be the next phase of computing, one where the Internet is a true peer-to-peer system, and all nodes participate and share resources. Instead of having expensive data centers with custom hardware and software solutions, billions of devices with idle processors can be harnessed to help solve a variety of problems affecting the enterprise, health care, the scientific community, and others.