The VMs’ memory (4 GB) seems pretty small for Cassandra. What heap size are you using? Which garbage collector? Are you seeing long GC times on the nodes? The basic rule of thumb is to give the Cassandra heap 50% of the RAM on the host. 2 GB isn’t very much.
Also, I wouldn’t set the replication factor to 5 (the number of nodes). If RF is always equal to the number of nodes, you can’t really scale beyond the size of the disk on any one node (all data is on each node). A replication factor of 3 would be more like a typical production set-up.
Hi Apache Cassandra experts,
we are running a set of availability evaluations under a write/read/update workloads with Apache Cassandra and experience some unexpected results, i.e. 0 ops/s over a period up to 100s.
In order to provide a clear picture find below the details of (1) the setup and (2) the evaluation workflow
Cassandra version: 3.11.2
M.Sc. Daniel Seybold
Institut Organisation und Management
von Informationssystemen (OMI)
Phone: +49 (0)731 50-28 799
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