Hi, P95 should not be a problem if rightly designed. Levelled compaction strategy further reduces this, however it consume some resources. For read, caching is also helpful. Can you check your cpu iowait as it could be the reason for delay
Regards, Ashish On Fri, 11 Aug, 2023, 04:58 Shaurya Gupta, <shaurya.n...@gmail.com> wrote: > Hi community > > What is the expected P95 latency for Cassandra Read and Write queries > executed with Local_Quorum over a table with 3 replicas ? The queries are > done using the partition + clustering key and row size in bytes is not too > much, maybe 1-2 KB maximum. > Assuming CPU is not a crunch ? > > We observe those to be 40 ms P95 Reads and same for Writes. This looks > very high as compared to what we expected. We are using Cassandra 4.0. > > Any documentation / numbers will be helpful. > > Thanks > -- > Shaurya Gupta > > >
