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From Jeremy Hanna <jeremy.hanna1...@gmail.com>
Subject Re: leveled compaction and tombstoned data
Date Thu, 08 Nov 2012 19:37:49 GMT
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 <synfinatic@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 <btoddb@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 <hsn@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"
> 


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