Hacker News Reader

jeremiahjordanon Improving compaction in Cassandra with cardinality estimation

This is an interesting use of the HyperLogLog algorithm. And yay for less RAM overhead.

jeremiahjordanon Why Cassandra Doesn't Need Vector Clocks

They are atomic, they are not isolated. Those are two different properties. The "A" vs the "I" in ACID. http://en.wikipedia.org/wiki/ACID

Edit: Actually, they are isolated in the sense of ACID, doesn't matter what order you do to operations, the answer will be the same. But not isolated the way you want isolated described.

jeremiahjordanon Big Data Debate: HBase

"Minutes" is not "unaffected" if your site is now down.

jeremiahjordanon Packagers don't know best

This is the reason our company creates their own packages and runs our own repositories.

jeremiahjordanon Dynamo Systems Work Too Hard

But that isn't W=1

jeremiahjordanon Dynamo Systems Work Too Hard

even if switch failures are rarer, couch at W=1 will silently drop data for network partition, dynamo at W=2 won't, how is the comparison at the end valid?