I was looking at Cassandra, one of the major NoSQL solutions, and I was immediately impressed with its write speed even on my notebook. But I also noticed that it was very volatile in its response time, so I took a deeper look at it.

First Cassandra Write Test

I did the first write tests on my local machine, but I had a goal in mind. I wanted to see how fast I could insert 150K data points each consisting of 3 values. In Cassandra terms this meant I added 150K of rows in a single Column Family and adding three columns each time. Don’t be confused with the term column here, it really means a key/value pair. At first I tried to load the 150K in one single mutator call. It worked just fine, but I had huge GC suspensions.


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