'Cascading bug' crashes Twitter

Microblogging site Twitter suffered an outage yesterday. The company explained last night that the reason for the outage was a 'cascading bug'.

"This wasn't due to a hack or our new office or Euro 2012 or GIF avatars, as some have speculated today. A 'cascading bug' is a bug with an effect that isn’t confined to a particular software element, but rather its effect 'cascades' into other elements as well," Vice president of engineering Mazen Rawashdeh said on the company blog.

"One of the characteristics of such a bug is that it can have a significant impact on all users, worldwide, which was the case today. As soon as we discovered it, we took corrective actions, which included rolling back to a previous stable version of Twitter."

The outage started around 9 a.m. Pacific, at which point Twitter was inaccessible for all Web users, while Twitter apps were not showing new tweets. The service started coming back online around 10:10 a.m., but dropped again a half hour later and "began full recovery" by 11:08 a.m.

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