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Twitter in UK and US outage


The social media company blamed the two-hour glitch on dual data centre crashes

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Twitter said Thursday's outage that lasted as long as two hours for some users was caused by separate data centres failing at nearly the same time.

Twitter went down between around 4.30pm BST and was back in action by about 6.25pm, according to Mazen Rawashdeh, vice president of engineering. Though some users suspected an overload of tweets related to the Olympic Games, which opens on Friday in London, that was not the cause of the outage.

Instead, two data centres that operate in parallel for redundancy both failed, in what Rawashdeh called an "infrastructural double whammy."

"What was noteworthy about the outage was the coincidental failure of two parallel systems at nearly the same time," Rawashdeh said. "We are investing aggressively in our systems to avoid this situation in the future."

It was Twitter's second outage in about six weeks. On 21 June, the microblogging service went down for an hour and started to come back, only to fail again before full recovery. The company blamed that outage on a cascading bug, a type of problem that spreads from one software element to others.

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Twitter in UK and US outage
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