Hello everyone, I am benchmarking a Cassandra installation on Azure composed of 4 nodes (Standard_D2S_V3 - 2vCPU and 8GB ram) with a replication factor of 2. To benchmark this testbed, I am using a single YCSB instance with the workload C (100% read request), a Consistency level ONE and only 10 clients ( so very low load).
However, I founded that the average latency gathered by YCSB is much different from the one obtained from the JMX (org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Latency) I ran the workload for over an hour and: - YCSB returns around 4000 us as average latency - JMX returns around 780 us as average latency It is a quite an important difference in performance that I don't know how to justify. Do you have any idea from where this difference comes from? Regarding the throughput, the value is the same across both the reading (~2400ops/sec) Thank in advance Salvatore
