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 680FD6D90 for ; Sun, 17 Jul 2011 18:29:44 +0000 (UTC) Received: (qmail 57420 invoked by uid 500); 17 Jul 2011 18:29:42 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 57295 invoked by uid 500); 17 Jul 2011 18:29:41 -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 57282 invoked by uid 99); 17 Jul 2011 18:29:41 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 17 Jul 2011 18:29:41 +0000 X-ASF-Spam-Status: No, hits=-0.0 required=5.0 tests=SPF_HELO_PASS,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of izquierdo@strands.com designates 217.116.18.226 as permitted sender) Received: from [217.116.18.226] (HELO mail.strands.com) (217.116.18.226) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 17 Jul 2011 18:29:33 +0000 Received: from localhost (localhost [127.0.0.1]) by mail.strands.com (Postfix) with ESMTP id 84433304975 for ; Sun, 17 Jul 2011 20:29:12 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at strands.com X-Spam-Score: -9.5 X-Spam-Level: Received: from mail.strands.com ([127.0.0.1]) by localhost (mail.strands.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KW5teNmo2zuA for ; Sun, 17 Jul 2011 20:29:12 +0200 (CEST) Received: from [192.168.1.141] (247.66.217.87.dynamic.jazztel.es [87.217.66.247]) (using SSLv3 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: izquierdo) by mail.strands.com (Postfix) with ESMTPSA id E2552304973 for ; Sun, 17 Jul 2011 20:29:11 +0200 (CEST) Subject: Re: Anyone using Facebook's flashcache? From: =?ISO-8859-1?Q?H=E9ctor?= Izquierdo Seliva To: user@cassandra.apache.org In-Reply-To: <4E1D242E.8050306@dude.podzone.net> References: <4E1C61F8.7040103@dude.podzone.net> <4E1C84B0.1070306@dude.podzone.net> <4E1D242E.8050306@dude.podzone.net> Content-Type: text/plain; charset="UTF-8" Date: Sun, 17 Jul 2011 20:29:10 +0200 Message-ID: <1310927350.1931.13.camel@Avalon> Mime-Version: 1.0 X-Mailer: Evolution 2.32.2 Content-Transfer-Encoding: 7bit X-Old-Spam-Flag: NO X-Old-Spam-Status: No, score=-9.5 required=5.1 tests=[ALL_TRUSTED=-5.5, BAYES_00=-4] autolearn=ham I've been using flashcache for a while in production. It improves read performance and latency was halved by a good chunk, though I don't remember the exact numbers. Problems: compactions will trash your cache, and so will memtable flushes. Right now there's no way to avoid that. If you want, I could dig the numbers for a before/after comparison.