2011/2/16 Aaron Morton <aa...@thelastpickle.com>
> JVM heap memory is controlled by the settings in conf/Cassandra-env.sh
>
> Memory mapped files will use additional virtual memory, is controlled in
> conf/Cassandra.yaml disk_access_mode
>
>
And??? JVM memory heap in cassandra 0.7 is by default half of memory is
system in my case 4GB, here is a part of cassandra-env.sh:
calculate_heap_size()
{
case "`uname`" in
Linux)
system_memory_in_mb=`free -m | awk '/Mem:/ {print $2}'`
MAX_HEAP_SIZE=$((system_memory_in_mb / 2))M
return 0
;;
FreeBSD)
system_memory_in_bytes=`sysctl hw.physmem | awk '{print $2}'`
MAX_HEAP_SIZE=$((system_memory_in_bytes / 1024 / 1024 / 2))M
return 0
;;
*)
MAX_HEAP_SIZE=1024M
return 1
;;
esac
}
I set all this options by default. All my nodes have 8GB of memory. And i
affraid that after some time all my nodes goes to hard swap, and only reboot
help them :-(((
PS: as i understand that down sometime of cassandra is normal?
