#cassandra

"In this guest post Jake Luciani (@tjake) introduces Lucandra, a Cassandra-based backend for Lucene."

"At Cloudkick we track a ton of metrics about our customer's servers and it's quite a challenge to store such massive amounts of data. Early on, we made the decision to avoid using tools like RRDTool, so we could provide a more holistic look at infrastructure. We had two firm requirements: we wanted to show trends on a macro-level and to have very low latency so our users would never wait for graphs to build. We initially used PostgreSQL, but as we added billions of rows, the performance quickly degraded. We used cron jobs that would roll up the data on intervals to trade storage for throughput and lower latency. With clever partitioning, we were able to stretch the system to a certain point, but beyond that we faced issues of needing a much bigger machine and faster rotational disks to accommodate our business requirements; that's when started looking at other solutions."

"It looks like the Digg guys are the most public about their usage of Cassandra. Arin’s presentation below is a bit less technical than the ☞ article published a while back, but also has some nice additions."

"here is the conversation I had with Ryan King (@rk) about Cassandra usage at Twitter"

"For college, I was playing with cassandra and thought I would document my experience in setting up a small cassandra cluster for playing around with. For this article, I actually used virtual machines (3 of them). I am assuming that we have a fresh ubuntu installation on each node. I'm also assuming static IP addresses so the /etc/hosts file on each node will have the following entries ("

"The PHP Thrift extension doesn't compile on Mac OS X, because it's missing byteorder.h. The attached patch works around this issue, but probably isn't the correct implementation. I imagine that it needs to be integrated into autoconf, but it gets the extension compiling for now."

Inserting and then deleting a column isn't reflected in a change in get_count