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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: leveled compaction and tombstoned data
Date Sat, 10 Nov 2012 17:40:40 GMT
@Rob Coli

Does the "sstablesplit" function exists somewhere ?


2012/11/10 Jim Cistaro <jcistaro@netflix.com>

> For some of our clusters, we have taken the periodic major compaction
> route.
>
> There are a few things to consider:
> 1) Once you start major compacting, depending on data size, you may be
> committed to doing it periodically because you create one big file that
> will take forever to naturally compact agaist 3 like sized files.
> 2) If you rely heavily on file cache (rather than large row caches), each
> major compaction effectively invalidates the entire file cache beause
> everything is written to one new large file.
>
> --
> Jim Cistaro
>
> On 11/9/12 11:27 AM, "Rob Coli" <rcoli@palominodb.com> wrote:
>
> >On Thu, Nov 8, 2012 at 10:12 AM, B. Todd Burruss <btoddb@gmail.com>
> wrote:
> >> 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?
> >
> >You could also...
> >
> >1) run a major compaction
> >2) code up sstablesplit
> >3) profit!
> >
> >This method incurs a management penalty if not automated, but is
> >otherwise the most efficient way to deal with tombstones and obsolete
> >data.. :D
> >
> >=Rob
> >
> >--
> >=Robert Coli
> >AIM&GTALK - rcoli@palominodb.com
> >YAHOO - rcoli.palominob
> >SKYPE - rcoli_palominodb
> >
>
>

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