“64-node clusters ought to be enough for anybody.” Bill Gates, quoted from memory. This post is part of the CAP theorem series. You may want to start by my post on ACID vs. CAP if you have a database background but have never really been exposed to the CAP theorem. The post discussing some traps in ...

“If you are not too long, I will wait here for you all my socketReadTimeout.” - Oscar Wilde, quoted from memory. This post is part of the CAP theorem series. You may want to start by my post on ACID vs. CAP if you have a database background but have never really been exposed to the CAP theorem. The ...

“I suppose it is tempting, if the only tool you have is a timeout, to treat everything as if it were a partition.” - Abraham Maslow, quoted from memory This post is part of the CAP theorem series. You may want to start by my post on ACID vs. CAP if you have a database background but have never reall...

“A son can bear with equanimity the loss of his father, but the loss of his data may drive him to despair.” (Machiavelli, quoted from memory) While traditional databases are ACID, with the ‘D’ meaning Durability, the NoSQL databases are mainly described by their memory model, i.e. Strong Consistency...

“Those are my consistency models, and if you don't like them... well, I have others.” - Groucho Marx, quoted from memory The CAP theorem series is coming to an end. I have a few posts planned, but they will be mainly about wrapping things-up-- I hope these posts will be great, though. Anyway, here s...

“Those who would give up Consistency, to purchase a little temporary Availability, deserve neither Consistency nor Availability.” (B. Franklin, quoted from memory) This post is part of the CAP theorem series. You may want to start by my post on ACID vs. CAP if you have a database background but have...

This post is part of the CAP theorem series. You may want to start by my post on ACID vs. CAP if you have a database background but have never really been exposed to the CAP theorem. The post discussing some traps in the ‘Availability’ and ‘Consistency’ definition of CAP should also be used as an in...

CAP and ACID share a common vocabulary: Atomic, Consistent, and so on. But there is a catch: the words are the same but they mean totally different things. CAP comes from the distributed systems theory, while ACID belongs to database systems one.The  Distributed Databases use both CAP and ACID vocab...

In the previous post, we looked at this common saying: “nodes fail, network packets get lost, partitions happen so you need to use CAP to understand your trade-offs.” We saw that node failures were not partitions. What about packet losses? Most distributed applications use TCP or UDP on top of IP, a...

"Dead nodes don't bite." - Robert Louis Stevenson (quoted from memory) CAP is often described as a theorem you cannot avoid using. A common saying is “nodes fail, network packets get lost, partitions arise so you need to use CAP to choose the trade-offs.” Actually, the CAP scope is not that wide. Le...

Eventual Consistency (EC) is a well known concept. The CAP theorem, which defines Consistency, Availability and Partition tolerance is also well known. It describes some distributed systems such as CP, which has two properties: Consistency and Partition tolerance. If we look at data stores just by h...

Let me introduce a new series of posts on the CAP theorem. CAP is a well known theorem conjectured and proven by recognized researchers in distributed systems, namely Eric Brewer, Seth Gilbert and Nancy Lynch. It is also widely used to categorize distributed applications. With CAP, do computer scien...