I followed the recommendations at http://www.datastax.com/documentation/cassandra/2.0/webhelp/index.html#cassandra/install/installRecommendSettings.html and did:
$ sudo swapoff -all on each of the cassandra servers in my test cluster. I noticed, though, that sometimes the cassandra server and other processes on one of the nodes suddenly crashed, with no messages indicating why. It turns out that on that node there wasn't much memory, and I was running other processes, so when the OS detected that there was insufficient memory for an operation, it unceremoniously killed some processes. Doing "sudo swapo -a" fixed the problem. This happened on both CentOs 6.2 and CentOS 6.4. So, if you do "sudo swapoff -all" make sure you're not going to run out of memory! Donald A. Smith | Senior Software Engineer P: 425.201.3900 x 3866 C: (206) 819-5965 F: (646) 443-2333 dona...@audiencescience.com<mailto:dona...@audiencescience.com> [AudienceScience]
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