I was lucky enough to have the opportunity to speak at the Cassandra World Summit 2012 on August 8 in Santa Clara. It was an amazing opportunity to share with the community the types of things that SimpleReach does with Cassandra. Not only that, I learned a lot about the roadmap and got to put a bunch of faces with the names behind the project.
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Erics Tech Blog Thoughts, musings, and other idealistic (sometimes useful) systems and development hoopla.
Cassandra Summit 2012 Highlights
27 Aug 2012 — ericWhat’s So Great About Cassandra’s Composite Columns?
7 Aug 2012 — ericThere are a lot of things I really like about Cassandra. But one thing in particular I like in creating a schema is having access to composite columns (read about composite columns and their origins here on Datastax’s blog). Let’s start simple with explaining a composite columns and then we can dive right into why they are so much fun to work with.
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ec2-consistent-snapshot With Mongo
21 Apr 2011 — ericI setup MongoDB on my Amazon EC2 instance knowing full well that it would have to be backed up at some point. I also knew that by using XFS, I could take advantage of filesystem freezing in a similar fashion to LVM snapshots. I had remembered reading about backups on XFS with MySQL being done with ec2-consistent-snapshot. As with any piece of open source software, it just took a little tweaking to make it do what I wanted it to do.
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Getting a Random Record From a MongoDB Collection
9 Aug 2010 — ericOne of my issues with MongoDB is that, as of this writing, there is no way to retrieve a random record. In SQL, you can simply do something similar to “ORDER BY RAND()” (this varies depending on your flavor) and you can retrieve random records (at a slightly expensive query cost). There is not yet an equivalent in MongoDB because of its sequential access nature. There is a purely Javascript method in the MongoDB cookbook here. If you are really interested, I would also read the Jira ticket thread #533 on this issue.
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