IEICE Transactions on Communications
Online ISSN : 1745-1345
Print ISSN : 0916-8516
Special Section on Future Internet Technologies against Present Crises
On Tackling Flash Crowds with URL Shorteners and Examining User Behavior after Great East Japan Earthquake
Takeru INOUEShin-ichi MINATO
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2012 Volume E95.B Issue 7 Pages 2210-2221


Several web sites providing disaster-related information failed repeatedly after the Great East Japan Earthquake, due to flash crowds caused by Twitter users. Twitter, which was intensively used for information sharing in the aftermath of the earthquake, relies on URL shorteners like to offset its strict limit on message length. In order to mitigate the flash crowds, we examine the current Web usage and find that URL shorteners constitute a layer of indirection; a significant part of Web traffic is guided by them. This implies that flash crowds can be controlled by URL shorteners. We developed a new URL shortener, named, just after the earthquake; redirects users to a replica created on a CoralCDN, if the original site is likely to become overloaded. This surprisingly simple solution worked very well in the emergency. We also conduct a thorough analysis of the request log and present several views that capture user behavior in the emergency from various aspects. Interestingly, the traffic significantly grew up at previously unpopular (i.e., small) sites during the disaster; this traffic shift could lead to the failure of several sites. Finally, we show that has great potential in mitigating such failures. We believe that our experience will help the research community tackle future disasters.

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© 2012 The Institute of Electronics, Information and Communication Engineers
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