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by greglindahl
5165 days ago
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There are 2 parts to our high availability. First is on our frontend side. We have 2 nginx servers (using linux HA and vips) which send traffic out to the nodes of the cluster which are up, retrying to a different node in the case of failure or a slow reply. Deeper in the system, there are 3 copies of every piece of data. Both of these are fairly normal mechanisms; the 3-copy thing is used at Google and by Hadoop and friends. |
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