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Posted to user@cassandra.apache.org by Weijun Li <we...@gmail.com> on 2010/05/05 18:18:26 UTC

Anti compaction and readonly compaction?

What's the purpose of anti-compaction? In what scenario does Cassandra need
to split bit sstables into smaller piece? Also I noticed readonly compaction
in the code. What's the use of this compaction type?

Thanks,

-Weijun

Re: Anti compaction and readonly compaction?

Posted by Stu Hood <st...@rackspace.com>.

Readonly Compactions are used to hash column families for http://wiki.apache.org/cassandra/ArchitectureAntiEntropy . Roger's link refers to anticompaction specifically.

-----Original Message-----
From: "Weijun Li" <we...@gmail.com>
Sent: Wednesday, May 5, 2010 11:29am
To: user@cassandra.apache.org
Subject: Re: Anti compaction and readonly compaction?

Thanks Roger! It helps a lot!

On Wed, May 5, 2010 at 9:20 AM, Roger Schildmeijer
<sc...@gmail.com>wrote:

>  http://wiki.apache.org/cassandra/Streaming
>
> On 5 maj 2010, at 18.18em, Weijun Li wrote:
>
> What's the purpose of anti-compaction? In what scenario does Cassandra need
> to split bit sstables into smaller piece? Also I noticed readonly compaction
> in the code. What's the use of this compaction type?
>
> Thanks,
>
> -Weijun
>
>
>

Re: Anti compaction and readonly compaction?

Posted by Weijun Li <we...@gmail.com>.

Thanks Roger! It helps a lot!

On Wed, May 5, 2010 at 9:20 AM, Roger Schildmeijer
<sc...@gmail.com>wrote:

>  http://wiki.apache.org/cassandra/Streaming
>
> On 5 maj 2010, at 18.18em, Weijun Li wrote:
>
> What's the purpose of anti-compaction? In what scenario does Cassandra need
> to split bit sstables into smaller piece? Also I noticed readonly compaction
> in the code. What's the use of this compaction type?
>
> Thanks,
>
> -Weijun
>
>
>

Re: Anti compaction and readonly compaction?

Posted by Roger Schildmeijer <sc...@gmail.com>.

 http://wiki.apache.org/cassandra/Streaming

On 5 maj 2010, at 18.18em, Weijun Li wrote:

> What's the purpose of anti-compaction? In what scenario does Cassandra need to split bit sstables into smaller piece? Also I noticed readonly compaction in the code. What's the use of this compaction type?
> 
> Thanks,
> 
> -Weijun