Introducing Cloud Spanner, a Global Database Service
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Introducing Cloud Spanner, a Global Database Service
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Re: Introducing Cloud Spanner, a Global Database Service
#2I wonder how many people will get a seizure from that red-blue blinking rectangle in the video :(
Upd: Downvoting this warning will only increase that number.
Re: Introducing Cloud Spanner, a Global Database Service
#3Is this similar to AWS Aurora or is this something else completely different?
Re: Introducing Cloud Spanner, a Global Database Service
#4> Unlike most wide-area networks, and especially the public internet, Google controls the entire network and thus can ensure redundancy of hardware and paths, and can also control upgrades and operations in general
I know this is a single system, but I'll still say it. This seems like another step in a scary trend for our internet.
Re: Introducing Cloud Spanner, a Global Database Service
#5> Today, we’re excited to announce the public beta for Cloud Spanner, a globally distributed relational database service that lets customers have their cake and eat it too: ACID transactions and SQL semantics, without giving up horizontal scaling and high availability.
This is a bold claim. What do they know about the CAP theorem that I don't?
Separately, (emphasis mine):
> If you have a MySQL or PostgreSQL system that's bursting at the seams, or are struggling with hand-rolled transactions on top of an eventually-consistent database, Cloud Spanner could be the solution you're looking for. Visit the Cloud Spanner page to learn more and get started building applications on our next-generation database service.
From the rest of the article it seems like the wire protocol for accessing it is MySQL. I wonder if they mean to add a PostgreSQL compatibility layer at some point.
Re: Introducing Cloud Spanner, a Global Database Service
#6Is this similar to AWS Aurora or is this something else completely different?
Aurora is not globally distributed. Spanner is, and is based on Google research which takes advantage of atomic clocks installed in each server: https://research.google.com/archive/spanner-osdi2012.pdf
Edit: not every server has an atomic clock; see replies by Google employees
Re: Introducing Cloud Spanner, a Global Database Service
#7Is this similar to AWS Aurora or is this something else completely different?
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Re: Introducing Cloud Spanner, a Global Database Service
#8Is this similar to AWS Aurora or is this something else completely different?
Aurora is not globally distributed. Spanner is, and is based on Google research which takes advantage of atomic clocks installed in each server: https://research.google.com/archive/spanner-osdi2012.pdf Edit: not every server has an atomic clock; see replies by Google employees
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Re: Introducing Cloud Spanner, a Global Database Service
#9> Today, we’re excited to announce the public beta for Cloud Spanner, a globally distributed relational database service that lets customers have their cake and eat it too: ACID transactions and SQL semantics, without giving up horizontal scaling and high availability. This is a bold claim. What do they know about the CAP theorem that I don't? Separately, (emphasis mine): > If you have a MySQL or PostgreSQL system th…
"High availability" is not the same thing as the "A" in the CAP theorem. Spanner chooses consistency over availability, but it is a HA system in the sense that it can tolerate datacenter outages.
Re: Introducing Cloud Spanner, a Global Database Service
#10> Today, we’re excited to announce the public beta for Cloud Spanner, a globally distributed relational database service that lets customers have their cake and eat it too: ACID transactions and SQL semantics, without giving up horizontal scaling and high availability. This is a bold claim. What do they know about the CAP theorem that I don't? Separately, (emphasis mine): > If you have a MySQL or PostgreSQL system th…
What do they know about the CAP theorem that I don't?
I don't know your expertise on the subject, but they do have a post on this topic.
Some highlights:
"Does this mean that Spanner is a CA system as defined by CAP? The short answer is “no” technically, but “yes” in effect and its users can and do assume CA."
"The purist answer is “no” because partitions can happen and in fact have happened at Google, and during some partitions, Spanner chooses C and forfeits A. It is technically a CP system."
https://cloudplatform.googleblog.com/2017/02/inside-Cloud-Sp...