Re: Cassandra memory needs

2011-02-02 Thread buddhasystem
Oleg, I just wanted to add that I confirmed the importance of that "rule of thumb" the hard way. I created two extra CFs and was able to reliably crash the nodes during writes. I guess for the final setting I'll rely on results of my testing. But it's also important to not cause the swap death o

Re: Cassandra memory needs

2011-02-02 Thread Peter Schuller
> I am trying to understand the relationship between data set/SSTable(s) size > and > Cassandra heap. http://wiki.apache.org/cassandra/LargeDataSetConsiderations > For a rough rule of thumb, Cassandra's internal datastructures will require > about  memtable_throughput_in_mb * 3 * number of hot C