cassandra-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Zhu Han <han...@nutstore.net>
Subject Re: Re: how to upgrade my cassadra from SizeTieredCompaction to LeveledCompactiom
Date Mon, 14 May 2012 04:16:58 GMT
On Mon, May 14, 2012 at 10:34 AM, zhangcheng <zhangcheng@jike.com> wrote:

> thanks, Edward.
>
> In my test, when I changed to leveled strategy, the compaction can't
> finish for the reason that we have 700G new data every day!
>
> what can I do if I want to save the comapction space?
>

For so big dataset, you may trigger the manual compaction periodically as
long as there is not much deletions.

Putting several TB data to a single data requires much computing and IO
power to serve the read request or compaction.


>
>
>
>
> zhangcheng
>
> From: Edward Capriolo
> Date: 2012-05-14 10:14
> To: dev; zhangcheng
> Subject: Re: how to upgrade my cassadra from SizeTieredCompaction to
> LeveledCompactiom
> As soon as you use the CLI to change the compaction strategy for a
> column family Cassandra will consider all SSTables level 0 and being
> level-ing them.  With that much data, think hard before making the
> change. You have to understand how level ed will work with your
> workload.
>
> On Sun, May 13, 2012 at 10:09 PM, zhangcheng <zhangcheng@jike.com> wrote:
> >
> > There is 2T data on each server. Can someone give me some advice?
> >
> > Thanks.
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message