"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"
