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Data Portability in The Cloud

An Application Integration Problem, Not a Cloud Problem

Spectacular “cloud” failures over the past few weeks have raised the hue and cry for portability and interoperability across clouds for data.The problem is that the cry is based on the false assumption that a “cloud service” is the same as an “application service.”

Apparently Microsoft felt Google and Amazon were getting too much attention with their recent outages and decided to join the game. The absolute loss of data for thousands lots and lots of T-Mobile Sidekick users is regrettable and yes someone needs to address such issues but that someone is not a standards group or a committee or even Microsoft.

wrongThe problem here seems to be that people equate “cloud services” with “application services”. Sidekick, etc… is not a cloud service, it’s an application service and that’s an important distinction. Even if it were deployed in a cloud, which it is not, it would still be an application and not a cloud service. Yet folks continue to make this very basic and very important mistake despite the FUD that results from their inaccurate verbiage. For example, Lauren Weinstein’s blog on Microsoft’s recent Sidekick-related data loss, has this to say on the subject:

Another important related risk is being "locked into" particular cloud services.  Most cloud computing services make it as simple as possible to get your data into their universe.  But getting your data out again can often be anything but trivial.  If your data is "trapped in the cloud" and something goes wrong, it can be a very serious double whammy indeed.

Yes, users should be able to get their data out of a cloud with the same relative ease with which it went in, but we aren’t talking about cloud services we’re talking about application services. And interoperability and portability between applications has never, ever been a guarantee. E-mail is about the only exception to this rule and you can thank RFC 822 for that. Unless we’re willing to sit down and write this level of detail for every application known to man and every application that does not yet exist, consider e-mail data interoperability a fluke of nature and thank the powers that be that we have that much. No, HTML and HTTP don’t count because they don’t actually deal with data; they just define the transport, access, and presentation of data. There is a difference, and it’s on the same level as the difference that separates cloud services from application services.

Any application deployed in a cloud and accessed by users IS NOT A CLOUD SERVICE. I repeat, it’s NOT A CLOUD SERVICE. It’s an APPLICATION.


The “cloud service” is Microsoft’s platform. A “cloud service” is Google’s platform, or Salesforce.com’s platform, or BlueLock or GoGrid or Amazon. A “cloud service” is used by IT, by developers, by the technical community at large. What consumers access is an application, and nothing more. They aren’t the user of the cloud service, they are the consumer of an application deployed in a cloud environment. Google Docs is an application. Gmail is an application. Twitter is an application. None of these are “cloud” services, even when using APIs designed to integrate them with other applications; they are still, always and forever, applications.

Interoperability and portability, whichever Lauren (and others) is calling for, is not going to solve this problem. This problem can only be solved by the application provider, which in this case is T-Mobile. It is the responsibility of T-Mobile to provide a means by which the data stored in its application can be transferred to another application – cloud-based or otherwise – and its data is properly backed up (which is yet another piece of this supposed cloudtastrophe puzzle that isn’t being addressed enough). And that’s it. It is the responsibility of other application providers to offer a means by which that data can be imported and transferred to their application, thus providing the portability that is apparently demanded by consumers if we are to listen to the myriad cries erupting at every little hiccup in the cloudosphere.

Portability of application services, like Sidekick, is not a cloud problem. It is an ancient problem that goes back to the first attempt at sharing data across two applications that continues to plague enterprises and developers like some kind of immortal, invulnerable locust. An entire software industry focuses on making this process as simple as possible; you may have heard of it, it’s called enterprise application integration (EAI). This industry exists because no two applications store their data in exactly the same way or in the same format or in the same database. Thus there are standards and tools provided to allow two applications to share, extract, transform, and otherwise access that data.

Lauren mentions this later in her post:

There are positive ways to proceed. Google, for example, a leader in cloud computing, has recently launched a specific project -- The Data Liberation Front -- explicitly including as a key facet the goal of making sure that users can quickly and easily export data from Google products. This ambitious and extremely important effort should be a model for the rest of the cloud computing industry.

Note the operative “from Google products.” Google isn’t going to provide interoperability or portability of its cloud services, it’s providing access to application data that effectively promotes integration of its application services with third-party application services – wherever they may be hosted. This is no different than taking advantage of Salesforce.com’s Web Services API to enable integration between its application services and some enterprise-hosted application.

But the cloud services, which are the applications, will be no more or less portable than they are today when at last you can get at the data. Because that data, surely in some kind of raw format (XML, JSON, etc…) will not be usable by consumers anyway. It will need to be interpreted by yet another application. Another application that is, likely, running as a cloud-based application.

Once people start recognizing the distinction between the two then perhaps we’ll actually be able to make some headway toward resolving the application integration challenges in the cloud. Until then, we’re just spewing so much pollution into the clouds with these calls for “cloud” portability and interoperability that no one can see what’s really necessary.

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More Stories By Lori MacVittie

Lori MacVittie is responsible for education and evangelism of application services available across F5’s entire product suite. Her role includes authorship of technical materials and participation in a number of community-based forums and industry standards organizations, among other efforts. MacVittie has extensive programming experience as an application architect, as well as network and systems development and administration expertise. Prior to joining F5, MacVittie was an award-winning Senior Technology Editor at Network Computing Magazine, where she conducted product research and evaluation focused on integration with application and network architectures, and authored articles on a variety of topics aimed at IT professionals. Her most recent area of focus included SOA-related products and architectures. She holds a B.S. in Information and Computing Science from the University of Wisconsin at Green Bay, and an M.S. in Computer Science from Nova Southeastern University.

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