CODEWITHSUNDEEP
google-cloud-platformgoogle-cloud-spanner
m.jack
m.jack

Reputation: 13

What happens if Cloud Spanner fails

Jan 2018 Spanner was down for 41 minutes in a region. What’s the alternative if Spanner goes down for 6 hours (assuming the worst case scenario) in a region.

Upvotes: 0

Views: 275

Answers (2)

RedPandaCurios
RedPandaCurios

Reputation: 2324

There are effectively 2 alternatives:

Wait for the outage to recover...

Or

Import your last export (which you stored in a multi-region cloud storage bucket) into a new instance in another region.and point your application at that new instance.

This may take more time that the duration of the outage itself, and will require some complex re-syncing of data when the outage recovers.

There is also the preventative option of running a multi-region instance, but that can be very expensive, and has to be valued against the effective cost of an outage of your application.

Upvotes: 0

ericcco
ericcco

Reputation: 776

One of the specifications that you can see in the Cloud Spanner Overview is that is guaranteed max of 5 minutes of downtime (including planned downtime) on paper and in practice.

According to the Cloud Spanner SLA, there is specified a Monthly Uptime Percentage:

Multi-Regional Instance -> >=99.999%

Regional Instance -> 99.99%

Furthermore, in case Spanner was down for 6 hours in your region:

720 hours = total hours in a month

6 hours = Downtime suffered

Total Monthly Uptime Percentage = (720 - 6)/720 = 99.166%

As the Monthly Uptime Percentage is between 99.0% and 99.99%, and as specified in the documentation, you would get 10% of monthly bill for Cloud Spanner Regional that will be credited to future monthly bills.

Upvotes: 2

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