Cassandra Internals -- Writing
Cassandra Internals – Writing 2010-03-13 cassandra We’ve started using Cassandra as our next-generation data storage engine at OneSpot (replacing a very large Postgresql machine with a cluster of EC2 machines) and so I’ve been using it for the last few weeks. As I’m an infrastructure nerd and a big believer in understanding the various layers in the stack, I’ve been reading up a bit on how Cassand
Cassandra Internals -- Reading
Cassandra Internals – Reading 2010-03-17 cassandra In my previous post, I discussed how writes happen in Cassandra and why they are so fast. Now we’ll look at reads and learn why they are slow. Reading and Consistency One of the fundamental thereoms in distributed systems is Brewer’s CAP theorem: distributed systems can have Consistency, Availability and Partition-tolerance properties but can only
Cassandra Internals -- Tricks!
Cassandra Internals – Tricks! 2010-03-20 cassandra In my previous posts, I covered how Cassandra reads and writes data. In this post, I want to explain some of the trickery that Cassandra uses to provide a scalable distributed system. Gossip Cassandra is a cluster of individual nodes – there’s no “master” node or single point of failure – so each node must actively verify the state of the other cl
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