Return-Path: Delivered-To: apmail-hbase-user-archive@www.apache.org Received: (qmail 7744 invoked from network); 18 Dec 2010 21:38:34 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 18 Dec 2010 21:38:34 -0000 Received: (qmail 98017 invoked by uid 500); 18 Dec 2010 21:38:33 -0000 Delivered-To: apmail-hbase-user-archive@hbase.apache.org Received: (qmail 97877 invoked by uid 500); 18 Dec 2010 21:38:33 -0000 Mailing-List: contact user-help@hbase.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@hbase.apache.org Delivered-To: mailing list user@hbase.apache.org Received: (qmail 97869 invoked by uid 99); 18 Dec 2010 21:38:33 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 18 Dec 2010 21:38:33 +0000 X-ASF-Spam-Status: No, hits=0.7 required=10.0 tests=RCVD_IN_DNSWL_NONE,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: local policy) Received: from [98.139.53.196] (HELO nm11-vm0.bullet.mail.ac4.yahoo.com) (98.139.53.196) by apache.org (qpsmtpd/0.29) with SMTP; Sat, 18 Dec 2010 21:38:24 +0000 Received: from [98.139.52.193] by nm11.bullet.mail.ac4.yahoo.com with NNFMP; 18 Dec 2010 21:38:03 -0000 Received: from [98.139.52.184] by tm6.bullet.mail.ac4.yahoo.com with NNFMP; 18 Dec 2010 21:38:03 -0000 Received: from [127.0.0.1] by omp1067.mail.ac4.yahoo.com with NNFMP; 18 Dec 2010 21:38:03 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 497414.28786.bm@omp1067.mail.ac4.yahoo.com Received: (qmail 47365 invoked by uid 60001); 18 Dec 2010 21:38:03 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1292708283; bh=BAUHUelvm0+8iMvUwi3kiXnXpnFDhklKwN5cQv0aIR0=; h=Message-ID:X-YMail-OSG:Received:X-RocketYMMF:X-Mailer:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=GHhBWuKIKRObuAIG7XAcoA4t7P5MuP6kVt89+oowV+Y70Ga/eFFqiQdwfCZY0pM179WZ6dcsDi6zWYW1TjxYlhww77rfPLZkfHQSDza/shcfFtcTAqeRvysOPjc3PvQD83IkD7c6Tdz765NT6v5JjulhYfULmrNuUdQUiswbdEw= Message-ID: <190375.46741.qm@web65512.mail.ac4.yahoo.com> X-YMail-OSG: hZDiobQVM1lX6I2rRfoT2k5LjkQ4gUfH25oFw0UEaHCI.sg udEsCxxW1Qc_9JxiGiZBht5Ickj3NJinLrtoNpiSD2n3Ew1c5ivdKB.AQdM1 o3niWXO4JQTZ5ECWsbojHgICDeMaDCnAvgeXcTALWReSM1_ZjzXbNMrTPyQm RifqKcxFZYVxEDl5bfppPJI62SlsRcl_DycAU6SrkS_3N1O.3JCmIEajc.pK ARHdSoiq.IZvWxaoS.QYyPVq3Qn6YHi8Vux3XLpzrayqzw4JglbuG1mDLqU4 ek6mRfmXCs2Qs3y3JdnDUkeZrw9OM5_MGplExS1OhRnAiq.IEIn6uQ6lC3J2 JVVN8rujD_LRECsHY4bH1Qb4wBdHoNHwx4TYJ2eQDn8uEEyPadlkTDjt69qK .OjyVpv_X_PFD Received: from [69.111.79.82] by web65512.mail.ac4.yahoo.com via HTTP; Sat, 18 Dec 2010 13:38:03 PST X-RocketYMMF: apurtell X-Mailer: YahooMailClassic/11.4.20 YahooMailWebService/0.8.107.285259 Date: Sat, 18 Dec 2010 13:38:03 -0800 (PST) From: Andrew Purtell Reply-To: apurtell@apache.org Subject: Re: substantial performance degradation when using WAL To: user@hbase.apache.org In-Reply-To: <5CF69BFA-2E30-4050-B1AF-9B9FA427C7A9@xebia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Hey Friso, > The GC is G1, so it may look different from what you expect > from a GC log. I know it is considered experimental, but I > like the concept of it and think it's nice to gain some > experience with it. You are probably the first to use the G1 GC seriously with HBase. Would love to hear about your experiences with it. I've been looking at it from time to time but last time (with u14 I think) the JVM segfaulted just about constantly. Recently I spun up a cluster with u23 and a write heavy test with 0.90 stayed up. I have not had time to dig in more. P.S. You set sysctl vm.swappiness = 0 right? Best regards, - Andy Problems worthy of attack prove their worth by hitting back. - Piet Hein (via Tom White)