Category Archives: Cassandra

HOWTO: CentOS 7/Redhat 7 Firewalld Setup for Cassandra Server

How to do initial firewalld configuration for Cassandra Server and Opscenter on CentOS/Redhat 7 with 2 network interfaces, in my case Dell 1950/2950. First: verify that your network interfaces are associated with a NetworkManager zone: # grep -i zone /etc/sysconfig/network-scripts/ifcfg-* … Continue reading

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Hightail Buddies Up with Cleversafe

Little-heralded and questionably-accurate but significant article on cloud storage technology: Hightail buddies up with Cleversafe Why significant? In conjunction with other publicly-available information like LinkedIn, it documents the transitions in storage technology of a cloud storage provider from: DIY DAS/MySQL … Continue reading

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Top Utility for Cassandra Clusters – cass_top

DataStax’s OpsCenter is pretty, but sometimes you don’t want to chop holes in your firewall for the server and agents. So I wrote cass_top. It works like top, but colorizes the output of nodetool status. It also lets you build … Continue reading

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Perl Clients for Cassandra

The Perl module Net::Async::CassandraCQL supports CQL3 and comes with a few sample programs and several tests. To get the perldoc sample code to work: Perl 5.10 or higher is required. If you’re using Redhat 5 or CentOS 5, then use … Continue reading

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Notes on “Getting Started with Time Series Data Modeling” in Cassandra

Patrick McFadin’s tutorial on Getting Started with Time Series Data Modeling aka “The Weather Model” is a very good introduction to a few important concepts in Cassandra: it’s the canonical time series use case in Cassandra. (Try to DESCRIBE the … Continue reading

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