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In my clusters, I use jolokia so I can access JMX interface using HTTP. This way I can create scripts with Python that monitor Cassandra and send alerts to Nagios. What you should monitor: Java HEAP and GC Compactions pending Flushes pending Hinted Handoff pending Gossip Tasks pending Read / Write latency Key cache hit rate Down end point count ...


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You can use check Java Heap memory for each node. Like Total Java Heap Memory and Using Java Heap Memory. One most important is CPU Utilization for each node. Set alerts for errors. system.log have lots of information about. You may set alerts for data disk and log disk. Heartbeat check of servers like if you dont receive in few min it will get alerts to ...



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