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From Aaron Turner <synfina...@gmail.com>
Subject Re: leveled compaction and tombstoned data
Date Thu, 08 Nov 2012 19:33:35 GMT
"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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