What We Can Learn From Amazon’s Cloud Collapse

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What We Can Learn From Amazon’s Cloud Collapse by www.batteryfast.com
By battery
Dated: Apr 22, 2011
Call it Cloudgate, Cloudpocalyse or whatever you’d like, but the extended collapse of Amazon Elastic
Cloud Compute (EC2) is both a setback for cloud computing and an opportunity for us to figure out how to
stop it from happening again.
Call it Cloudgate, Cloudpocalyse or whatever you’d like, but the extended collapse of Amazon Elastic
Cloud Compute (EC2) is both a setback for cloud computing and an opportunity for us to figure out how to
stop it from happening again.

Amazon may be best-known for its online shopping site, but it also has a substantial cloud computing
business. It provides a scalable, flexible and particularly efficient solution for companies to store and
deliver massive amounts of content. Its model of only paying for what you consume was a radical
innovation when it launched in 2006.

In fact, Amazon Web Services has been so affordable and reliable that thousands of companies from
Foursquare to Netflix utilize the company’s cloud computing technology and servers to run their
businesses. They put their faith in Amazon’s cloud because there was no reason to think that it would falter.
One of cloud computing’s key tenets is reliability through redundancy of both servers and data centers.

Then on Wednesday, Amazon’s northern Virginia data center started experiencing problems that caused
major latency and connectivity issues. The trouble was apparently due to excessive re-mirroring of its
Elastic Block Storage (EBS) volumes — this essentially created countless new backups of the EBS
volumes that took up Amazon’s storage capacity and triggered a cascading effect that caused downtime on
hundreds (or more likely thousands) of websites for almost 24 hours.

The collapse took its share of victims. Among the most prominent companies affected were Foursquare,
Quora, Hootsuite, SCVNGR, Heroku, Reddit and Wildfire, though hundreds of other companies big and
small were affected. Luckily, one of Amazon’s most prominent customers, Netflix, didn’t experience
problems because it’s built for the loss of an entire data center, while companies relying on Amazon’s four
other global data centers didn’t experience too many issues.

A Learning Moment

FathomDB founder Justin Santa Barbara has a detailed post on his blog about what may be the biggest
problem to come out of this week’s collapse: Amazon’s cloud redundancies failed to stop a mass outage. Its
Availability Zones are supposed to be able to fail independently without bringing the whole system down.
Instead, there was a single point of failure that shouldn’t have been there.

This week’s disaster in the cloud is a reminder to startups to build redundancy into their applications and
their own systems, but as Santa Barbara points out, most startups don’t have the time or resources to
engineer for multiple cloud systems (each Amazon global region/data center has its own rules and features,
making a simple “switch” to another center difficult). These companies trusted Amazon to keep them
online, and Amazon failed to deliver.

Catastrophic issues will always occur, but in the pre-cloud era, downtime only affected a single computer
or website. Today, a catastrophic event takes down thousands of websites, causing millions or even billions
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PR Log - Global Press Release Distribution
of dollars in lost revenue and productivity.

This incident is no reason for us to shun cloud computing, though. Its benefits (scalability, cost reduction,
device independence, performance and more) far outweigh its cons. We do need to take a hard look at how
we structure our cloud infrastructure though and find new ways to either prevent single points of failure or
quickly move content off failing clouds faster, especially as the world’s computing power is consolidated
into fewer and fewer systems.

Cloud computing is still in its infancy, and today’s events make it clear that we still have a lot of work to
do. It could be a whole lot worse next time if we aren’t prepared.

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