http://www.datastax.com/docs/1.1/operations/tuning#testing-compaction-and-compression
Write Survey mode. After you have it up and running you can modify the column family mbean to use LeveledCompactionStrategy on that node to see how your hardware/load fares with LCS. On Thu, Nov 8, 2012 at 11:33 AM, 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" > > -- Ben Coverston DataStax -- The Apache Cassandra Company
