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Last Friday, I gave a talk a the LinuxTag conference in Berlin (BTW, "Tag" means "Day" in German) on Cassandra. The goal was to give an introduction to Cassandra and also talk a bit about the experiences we've made with Cassandra at TWIMPACT.

I also got some interesting feedback. In particular, someone pointed out that we're having pretty atypically high write rates in our analysis application compared to normal web applications, also leading to more frequent compaction.

I probably should also add that we've recently moved away from Cassandra to a completely memory based approach. We felt that real-time demanded that you hold all your important data in memory and use disk only to store logs and other aggregated data.

I'm also not saying that Cassandra (or Postgres for the matter) is inherently slow or buggy, I think (as always) it's very much a matter of what kinds of requirements you have.

Posted by Mikio L. Braun at 2011-05-16 00:00:00 +0200