Hi, I'm doing stress test on Cassandra. And I learn that using ring cache can improve the performance because the client requests can directly go to the target Cassandra server and the coordinator Cassandra node is the desired target node. In this way, there is no need for coordinator node to route the client requests to the target node, and maybe we can get the linear performance increment.
However, in my stress test on an Amazon EC2 cluster, the test results are weird. Seems that there's no performance improvement after using ring cache. Could anyone help me explain this results? (Also, I think the results of test without ring cache is weird, because there's no linear increment on QPS when new nodes are added. I need help on explaining this, too). The results are as follows: INSERT(write): Node count Replication factor QPS(No ring cache) QPS(ring cache) 1 1 18687 20195 2 1 20793 26403 2 2 22498 21263 4 1 28348 30010 4 3 28631 24413 SELECT(read): Node count Replication factor QPS(No ring cache) QPS(ring cache) 1 1 24498 22802 2 1 28219 27030 2 2 35383 36674 4 1 34648 28347 4 3 52932 52590 Thank you very much, Joy
