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Posted to dev@cassandra.apache.org by zhangcheng <zh...@jike.com> on 2012/05/14 04:09:35 UTC
how to upgrade my cassadra from SizeTieredCompaction to LeveledCompactiom
There is 2T data on each server. Can someone give me some advice?
Thanks.
Re: Re: how to upgrade my cassadra from SizeTieredCompaction to LeveledCompactiom
Posted by Zhu Han <sc...@gmail.com>.
On Mon, May 14, 2012 at 10:34 AM, zhangcheng <zh...@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 <zh...@jike.com> wrote:
> >
> > There is 2T data on each server. Can someone give me some advice?
> >
> > Thanks.
>
Re: Re: how to upgrade my cassadra from SizeTieredCompaction to LeveledCompactiom
Posted by Zhu Han <ha...@nutstore.net>.
On Mon, May 14, 2012 at 10:34 AM, zhangcheng <zh...@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 <zh...@jike.com> wrote:
> >
> > There is 2T data on each server. Can someone give me some advice?
> >
> > Thanks.
>
Re: Re: how to upgrade my cassadra from SizeTieredCompaction to LeveledCompactiom
Posted by zhangcheng <zh...@jike.com>.
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?
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 <zh...@jike.com> wrote:
>
> There is 2T data on each server. Can someone give me some advice?
>
> Thanks.
Re: how to upgrade my cassadra from SizeTieredCompaction to LeveledCompactiom
Posted by Edward Capriolo <ed...@gmail.com>.
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 <zh...@jike.com> wrote:
>
> There is 2T data on each server. Can someone give me some advice?
>
> Thanks.