Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 30E38D86A for ; Mon, 19 Nov 2012 21:45:49 +0000 (UTC) Received: (qmail 4391 invoked by uid 500); 19 Nov 2012 21:45:46 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 4369 invoked by uid 500); 19 Nov 2012 21:45:46 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 4360 invoked by uid 99); 19 Nov 2012 21:45:46 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 19 Nov 2012 21:45:46 +0000 X-ASF-Spam-Status: No, hits=-0.1 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_MED,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of andras.szerdahelyi@ignitionone.com designates 216.82.254.211 as permitted sender) Received: from [216.82.254.211] (HELO mail201.messagelabs.com) (216.82.254.211) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 19 Nov 2012 21:45:39 +0000 X-Env-Sender: andras.szerdahelyi@ignitionone.com X-Msg-Ref: server-14.tower-201.messagelabs.com!1353361517!8359864!1 X-Originating-IP: [208.52.173.249] X-StarScan-Received: X-StarScan-Version: 6.6.1.8; banners=-,-,- X-VirusChecked: Checked Received: (qmail 25193 invoked from network); 19 Nov 2012 21:45:17 -0000 Received: from mail.dentsunetwork.com (HELO mail.dentsunetwork.com) (208.52.173.249) by server-14.tower-201.messagelabs.com with AES128-SHA encrypted SMTP; 19 Nov 2012 21:45:17 -0000 Received: from ATL02MB02.corp.local ([fe80::7997:c980:b031:df37]) by ATL02HUB01.corp.local ([::1]) with mapi id 14.02.0318.004; Mon, 19 Nov 2012 16:45:18 -0500 From: Andras Szerdahelyi To: "user@cassandra.apache.org" Subject: Re: row cache re-fill very slow Thread-Topic: row cache re-fill very slow Thread-Index: AQHNxmCnofj/Qg0RfkyyTZAt+Gbix5fx+QAAgAAGMoCAAAYmgA== Date: Mon, 19 Nov 2012 21:45:16 +0000 Message-ID: References: <1353360187.15743.YahooMailNeo@web160905.mail.bf1.yahoo.com> In-Reply-To: <1353360187.15743.YahooMailNeo@web160905.mail.bf1.yahoo.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.0.90.2] Content-Type: multipart/related; boundary="_004_FE84AE7AAE9A2B4EA73512EED142BEF830BFC058ATL02MB02corplo_"; type="multipart/alternative" MIME-Version: 1.0 X-Virus-Checked: Checked by ClamAV on apache.org --_004_FE84AE7AAE9A2B4EA73512EED142BEF830BFC058ATL02MB02corplo_ Content-Type: multipart/alternative; boundary="_000_FE84AE7AAE9A2B4EA73512EED142BEF830BFC058ATL02MB02corplo_" --_000_FE84AE7AAE9A2B4EA73512EED142BEF830BFC058ATL02MB02corplo_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Wei, i'm using the off-heap ( serialised ) row cache and front the entire thing = with memcached in the middle layer ( to prevent the most actively requested= rows from pressuring the Cassandra heap ). If you ask how much the pointer= s to the off-heap memory will take.. time will tell ( it should be easy to = calculate though ) It's been working out great. Andras Szerdahelyi Solutions Architect, IgnitionOne | 1831 Diegem E.Mommaertslaan 20A M: +32 493 05 50 88 | Skype: sandrew84 [cid:7BDF7228-D831-4D98-967A-BE04FEB17544] On 19 Nov 2012, at 22:23, Wei Zhu > wrote: Just curious Andras, how can you manage such a big row cache (10-15GB curre= ntly)? By recommendation, you will have 10% of your heap as row cache, so y= our heap is over 100G?? The largest datastax recommends is 8GB and it seems= to be a hardcoded limit in cassandra-env.sh ( # calculate 1/4 ram and cap = to 8192MB). Does you GC hold up with such a big heap? In my experience, ful= l GC could take over 20 seconds for such a big heap. --_000_FE84AE7AAE9A2B4EA73512EED142BEF830BFC058ATL02MB02corplo_ Content-Type: text/html; charset="iso-8859-1" Content-ID: <9FF39BC2A6537348B2932E8F19DA2D25@corp.local> Content-Transfer-Encoding: quoted-printable Wei,

i'm using the off-heap ( serialised ) row cache and front the entire t= hing with memcached in the middle layer ( to prevent the most actively requ= ested rows from pressuring the Cassandra heap ). If you ask how much the po= inters to the off-heap memory will take.. time will tell ( it should be easy to calculate though ) It's been = working out great.

Andras Szerdahelyi
Solutions Architect, IgnitionOne | 1831 Diegem E.Mommaertslaan 20A
M: +32 493 05 50 88 | Skype: sandrew84=





On 19 Nov 2012, at 22:23, Wei Zhu <wz1975@yahoo.com>
 wrote:

Just curious Andras, how can you manage such a big row c= ache (10-15GB currently)? By recommendation, you will have 10% of your heap as row cache= , so your heap is over 100G?? The largest datastax recommends is 8GB and it= seems to be a hardcoded limit in cassandra-env.sh ( # calculate 1/4 r= am and cap to 8192MB). Does you GC hold up with such a big heap? In my experience, full GC could take over 20 seco= nds for such a big heap.


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