Hi. I search informations for basic tunning of memory in Cassandra.
My situation : I started to test larges imports of data in Cassandra 6.1. My first import worked fine : 100 Millions row in 2 hours ~ around 10000 insert row by seconds My second is slower with the same script in another column family : ~ around 500 insert row by seconds... I didn't understand why I have a lot of GC for ConcurrentMarkSweep. [ GC for ConcurrentMarkSweep: 3437 ms, 104971488 reclaimed leaving 986519328 used; max is 1211170816. ] ( The max did'n't move, what is this value 1211170816 ? ) I think the GC process appear when the insert is slow. The inserts didn't work when the GC works ? My machine has 66M of RAM, and the processor java only use around 1.8 % How Can I optimise the use of memory ? There is a the guideline for best performances ? Thanks.
