Mailing-List: contact cassandra-user-help@incubator.apache.org; run by ezmlm
Precedence: bulk
Reply-To: cassandra-user@incubator.apache.org
Received-SPF: pass (athena.apache.org: domain of jbellis@gmail.com designates
 209.85.220.214 as permitted sender)
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=mime-version:in-reply-to:references:from:date:message-id:subject:to
         :content-type:content-transfer-encoding;
        b=j1GwO8kEXXJmBwWprxPAEQFIRXXEX7yFgdV6FFvvq3RtGkmU8ygYgQpw3jLiHL/DWu
         33DW+4Jt7hAMB9os30ZZe9vxd0Qypcah4Av11HdAtOXnWu4/l4sTMUYSvTF81lcA2qkj
         ziPwN3W51DkvnosxGhmGAIc/9qveXhV6zFpCA=
MIME-Version: 1.0
In-Reply-To: <f40963db0912021026n653e7977x9c95b1f285414fde@mail.gmail.com>
References: 
 <59DD1BA8FD3C0F4C90771C18F2B5B53A4C850190C6@GVW0432EXB.americas.hpqcorp.net>
	<e06563880912011110y354e1338mc8a255934e8263f4@mail.gmail.com>
	<59DD1BA8FD3C0F4C90771C18F2B5B53A4C850C15FE@GVW0432EXB.americas.hpqcorp.net>
	<e06563880912011818h6c9acfd9r8b85de67964fa337@mail.gmail.com>
	<f40963db0912021026n653e7977x9c95b1f285414fde@mail.gmail.com>
From: Jonathan Ellis <jbellis@gmail.com>
Date: Wed, 2 Dec 2009 12:32:15 -0600
Message-ID: <e06563880912021032i1ff782c4yb3f6954279d64281@mail.gmail.com>
Subject: Re: Persistently increasing read latency
To: cassandra-user@incubator.apache.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

We are using trunk.  0.5 beta / trunk is better than 0.4 at the 0.4
functionality and IMO is production ready (although you should always
test first), but I would not yet rely on the new stuff (bootstrap,
loadbalance, and moving nodes around in general).

-Jonathan

On Wed, Dec 2, 2009 at 12:26 PM, Adam Fisk <a@littleshoot.org> wrote:
> Helpful thread guys. In general, Jonathan, would you recommend
> building from trunk for new deployments at our current snapshot in
> time? Are you using trunk at Rackspace?
>
> Thanks.
>
> -Adam
>
>
> On Tue, Dec 1, 2009 at 6:18 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
>> On Tue, Dec 1, 2009 at 7:31 PM, Freeman, Tim <tim.freeman@hp.com> wrote:
>>> Looking at the Cassandra mbean's, the attributes of ROW-MUTATION-STAGE =
and ROW-READ-STAGE and RESPONSE-STAGE are all =A0less than 10. =A0MINOR-COM=
PACTION-POOL reports 1218 pending tasks.
>>
>> That's probably the culprit right there. =A0Something is wrong if you
>> have 1200 pending compactions.
>>
>> This is something that upgrading to trunk will help with right away
>> since we parallelize compactions there.
>>
>> Another thing you can do is increase the memtable limits so you are
>> not flushing + compacting so often with your insert traffic.
>>
>> -Jonathan
>>
>
>
>
> --
> Adam Fisk
> http://www.littleshoot.org | http://adamfisk.wordpress.com |
> http://twitter.com/adamfisk
>