My name is Philipp C. Heckel and I write about nerdy things.
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Posts Tagged / Distributed Systems


  • Feb 14 / 2014
  • 7
Cloud Computing, Programming, Synchronization

Deep into the code of Syncany – command line client, application flow and data model (part 2)

I recently published a blog post about my open source file sync project Syncany. I explained the main idea of the project and also went into some of the details about where the development is headed. The post was the first of a series I am planning to write — showing what the project is about from different angles.

While the first post had a few technical elements, it mostly discussed the project’s process and its high level goals and ideas. In this second article, I’d like to go beyond the high level concepts and go a lot deeper into the different packages and modules of the software. Why, you ask? Because I think it might be interesting of others and because I believe that supporters and other developers will benefit from it.

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  • Oct 18 / 2013
  • 30
Cloud Computing, Programming, Security, Synchronization

Syncany explained: idea, progress, development and future (part 1)

Many many moons ago, I started Syncany, a small open source file synchronization project that allows users to backup and share certain folders of their workstations using any kind of storage, e.g. FTP, Amazon S3 or Google Storage.

At the time of the initial annoucement of the project (May 2011), there was a big hype around it. I received many e-mails and lots of support from people around the world. People were excited because the features Syncany offers are great: File synchronization à la Dropbox, paired with storage flexibility (use-your-own), client-side encryption (sorry about that, NSA!), and intelligent versioning.

At the time, I didn’t actually release a runnable version of Syncany. The sole purpose of the announcement (on WebUpd8 and on the Ubuntu Podcast) was to get developers excited about the project in order to get help for the last steps of creating a somewhat stable release. Unfortunately, I was further away from this “stable release” than I could have imagined.

In this blog post, I’d like to recap the idea behind Syncany, what went wrong with the development, and how I brought the project back on track (or so I believe). I’ll also talk about what I plan to do with Syncany and how people can help (if they still want).

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  • May 20 / 2013
  • 3
Cloud Computing, Distributed Systems, Security, Synchronization

Minimizing remote storage usage and synchronization time using deduplication and multichunking: Syncany as an example

This post introduces my Master’s thesis “Minimizing remote storage usage and synchronization time using deduplication and multichunking: Syncany as an example”. I submitted the thesis in January 2012, and now found a little time to post it here.

The key goal of this thesis was to determine the suitability of deduplication for end-user applications — particularly for my synchronization application Syncany. As part of this work, the thesis introduces Syncany, a file synchronizer designed with security and provider independence as a core part of its architecture.

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  • May 08 / 2010
  • 0
Distributed Systems, Virtualization

Hybrid Clouds: A Comparison of Cloud Toolkits

In the last few years, the importance of the Internet has risen constantly and made it indispensable for businesses and most individuals to be on-line around the clock. One of the greatest drivers of this development was and still is the shift of the traditional one-to-many Web to an advanced, participatory version of the Word Wide Web. Rather than only making editorial information accessible to many users, the Web 2.0 encourages participation and enables user generated contributions. Leveraging this new paradigm, services like Flickr, Facebook, or Twitter have become very prominent examples for this development.

An essential part of this evolution, but mostly hidden to the end-consumer, is the set of tools that enable these large scale applications. Cloud computing is a relatively new technology that serves as underlying architecture for most of these platforms. By providing virtualized computing resources as a service in a pay-as-you-go manner, cloud computing enables new business models and cost effective resource usage. Instead of having to maintain their own data center, companies can concentrate on their core business and purchase resources when needed. Especially when combining a privately maintained virtual infrastructure with publicly accessible clouds in a hybrid cloud, the technology can open up new opportunities for businesses and help consolidating resources.
However, since cloud computing is a very new term, there are as many definitions of its components as there are opinions about its usefulness. Most of the corresponding technologies are only a few years old and the toolkits lack of maturity and interoperability.

This article introduces the basic concepts of cloud computing and discusses the technical requirements for setting up a hybrid cloud. It briefly looks into security concerns and outlines the status quo of current cloud technologies. In particular, it evaluates several existing cloud toolkits regarding its requirements, occurring problems and interoperability.

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