4 flush writers isn't bad since the default is 2. It doesn't make a
difference if you have fast disks (like NVMe SSDs) because only 1 thread
gets used.
But if flushes are slow, the work gets distributed to 4 flush writers so
you end up with smaller flush sizes although it's difficult to tell how
t
Hi Erick,
Thanks for your response.Actually we did not set the memtable_cleanup_threshold
in the cassandra.yaml.However, we have memtable_flush_writers: 4 defined in the
yaml, and VM node has 16-core.Any advice for this param's value?
Thanks again.Jiayong SunOn Tuesday, August 10, 2021, 09:2
Hi Erick,
The nodes have 4 SSD (1TB for each but we only use 2.4TB of space. Current disk
usage is about 50%) with RAID0. Based on number of disks we increased
memtable_flush_writers: 4 instead of default of 2.
For the following we set:- max heap size - 31GB- memtable_heap_space_in_mb (use
defa
