Return-Path: Delivered-To: apmail-hadoop-hbase-user-archive@minotaur.apache.org Received: (qmail 14698 invoked from network); 7 Mar 2010 15:21:45 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 7 Mar 2010 15:21:45 -0000 Received: (qmail 57042 invoked by uid 500); 7 Mar 2010 15:21:24 -0000 Delivered-To: apmail-hadoop-hbase-user-archive@hadoop.apache.org Received: (qmail 57004 invoked by uid 500); 7 Mar 2010 15:21:24 -0000 Mailing-List: contact hbase-user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hbase-user@hadoop.apache.org Delivered-To: mailing list hbase-user@hadoop.apache.org Received: (qmail 56996 invoked by uid 99); 7 Mar 2010 15:21:24 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 07 Mar 2010 15:21:24 +0000 X-ASF-Spam-Status: No, hits=4.7 required=10.0 tests=FREEMAIL_FROM,FREEMAIL_REPLY,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of michael_segel@hotmail.com designates 65.55.34.215 as permitted sender) Received: from [65.55.34.215] (HELO col0-omc4-s13.col0.hotmail.com) (65.55.34.215) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 07 Mar 2010 15:21:14 +0000 Received: from COL117-W52 ([65.55.34.199]) by col0-omc4-s13.col0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Sun, 7 Mar 2010 07:20:52 -0800 Message-ID: Content-Type: multipart/alternative; boundary="_5ee6235d-71a9-4d1a-b067-82686a21928c_" X-Originating-IP: [173.15.87.34] From: Michael Segel To: Subject: RE: Does the scanner interface have a "previous" method? Date: Sun, 7 Mar 2010 09:20:52 -0600 Importance: Normal In-Reply-To: <74f4d40b1003061938x18bcb959g10c147ff3d9bc2e2@mail.gmail.com> References: <758641621003060759x6883dcc5wf0f0b1a263f4571d@mail.gmail.com>,<7c962aed1003061417r6eb507f9p80b0c013bf640c22@mail.gmail.com>,<758641621003061756v78742341y7dac64a4da20ff58@mail.gmail.com>,<74f4d40b1003061938x18bcb959g10c147ff3d9bc2e2@mail.gmail.com> MIME-Version: 1.0 X-OriginalArrivalTime: 07 Mar 2010 15:20:52.0647 (UTC) FILETIME=[C66C9B70:01CABE09] X-Virus-Checked: Checked by ClamAV on apache.org --_5ee6235d-71a9-4d1a-b067-82686a21928c_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable What you're attempting to recreate is a 'scroll cursor'. On very large data sets=2C this isn't trivial to do. I think if you look at the use cases=2C you'll think of some other way of a= chieving your specific goals. Just my opinion... -Mike > Date: Sat=2C 6 Mar 2010 19:38:19 -0800 > Subject: Re: Does the scanner interface have a "previous" method? > From: erikholstad@gmail.com > To: hbase-user@hadoop.apache.org >=20 > Hey Hua! > I agree that this would be a nice to have feature for cases when you want= to > fetch data in > ascending and descending order. You would need to store any extra indices > just open up > a different scanner. > The best way to do this now though is to store it in a different index. >=20 > Good luck! > Erik =20 _________________________________________________________________ Hotmail: Trusted email with Microsoft=92s powerful SPAM protection. http://clk.atdmt.com/GBL/go/201469226/direct/01/= --_5ee6235d-71a9-4d1a-b067-82686a21928c_--