LCS works well in specific circumstances, this blog post gives some good considerations: http://www.datastax.com/dev/blog/when-to-use-leveled-compaction
On Nov 8, 2012, at 1:33 PM, Aaron Turner <synfina...@gmail.com> wrote: > "kill performance" is relative. Leveled Compaction basically costs 2x disk > IO. Look at iostat, etc and see if you have the headroom. > > There are also ways to bring up a test node and just run Level Compaction on > that. Wish I had a URL handy, but hopefully someone else can find it. > > Also, if you're not using compression, check it out. > > On Thu, Nov 8, 2012 at 11:20 AM, B. Todd Burruss <bto...@gmail.com> wrote: > we are running Datastax enterprise and cannot patch it. how bad is > "kill performance"? if it is so bad, why is it an option? > > > On Thu, Nov 8, 2012 at 10:17 AM, Radim Kolar <h...@filez.com> wrote: > > Dne 8.11.2012 19:12, B. Todd Burruss napsal(a): > > > >> my question is would leveled compaction help to get rid of the tombstoned > >> data faster than size tiered, and therefore reduce the disk space usage? > >> > > leveled compaction will kill your performance. get patch from jira for > > maximum sstable size per CF and force cassandra to make smaller tables, they > > expire faster. > > > > > > -- > Aaron Turner > http://synfin.net/ Twitter: @synfinatic > http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix & > Windows > Those who would give up essential Liberty, to purchase a little temporary > Safety, deserve neither Liberty nor Safety. > -- Benjamin Franklin > "carpe diem quam minimum credula postero" >
