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Learning Cassandra for Administrators by Vijay Parthasarathy

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Chapter 6. Analytics

It is important to understand that the analytics workload has characteristics that are different from normal reads and writes in Cassandra. In most cases, MapReduce jobs will have to read all or most of the data from Cassandra to run the analytics on it. Mixing the analytics workload and normal reads can cause poor performance on the regular read operations in the system. It will cause filesystem caches and other Cassandra caches to be trashed by the analytics workload. Hence, most users separate different workloads into different physical clusters, allowing the normal reads to be optimized by Cassandra.

It is important to note that this scenario is true not only for Cassandra, but for any other real-time data storage solution ...

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