From hbase-user-return-3189-apmail-hadoop-hbase-user-archive=hadoop.apache.org@hadoop.apache.org Tue Feb 17 19:27:28 2009 Return-Path: Delivered-To: apmail-hadoop-hbase-user-archive@minotaur.apache.org Received: (qmail 50897 invoked from network); 17 Feb 2009 19:27:27 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 17 Feb 2009 19:27:27 -0000 Received: (qmail 77123 invoked by uid 500); 17 Feb 2009 19:27:24 -0000 Delivered-To: apmail-hadoop-hbase-user-archive@hadoop.apache.org Received: (qmail 77085 invoked by uid 500); 17 Feb 2009 19:27:24 -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 76856 invoked by uid 99); 17 Feb 2009 19:27:23 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 17 Feb 2009 11:27:23 -0800 X-ASF-Spam-Status: No, hits=2.6 required=10.0 tests=DNS_FROM_OPENWHOIS,SPF_HELO_PASS,SPF_PASS,WHOIS_MYPRIVREG X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of lists@nabble.com designates 216.139.236.158 as permitted sender) Received: from [216.139.236.158] (HELO kuber.nabble.com) (216.139.236.158) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 17 Feb 2009 19:27:14 +0000 Received: from isper.nabble.com ([192.168.236.156]) by kuber.nabble.com with esmtp (Exim 4.63) (envelope-from ) id 1LZVao-0002pj-0h for hbase-user@hadoop.apache.org; Tue, 17 Feb 2009 11:26:54 -0800 Message-ID: <22064387.post@talk.nabble.com> Date: Tue, 17 Feb 2009 11:26:53 -0800 (PST) From: mirage1987 To: hbase-user@hadoop.apache.org Subject: Re: Improving hbase performance In-Reply-To: <22060928.post@talk.nabble.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Nabble-From: mirage1987@gmail.com References: <22060928.post@talk.nabble.com> X-Virus-Checked: Checked by ClamAV on apache.org Hey thanx for the quick reply.. well i have the following problem i have in place a distributed setup of hbase over hadoop (cluster of 3) i have in my hbase around 4 million entries wat i want now is an efficient way to do a get (read) from the hbase. I have multiple read requests. So i want them to be executed in parallel so tha the performance could imrove.(as sequential one would be too high). I want a performance of arnd 10 ms on an average. (Can u suggest wat is a good performance read time on a distributed hbase) So wat i tried was creating parallel threads each with itz own HTable instance and doin a get on the same table in parallel. But the performance was still bad. Could i be doin some mistake.....is it possible to create multiple instances of hbase that could be accessed in parallel. Second thought i have is can i do the same thing with Mapreduce... Can u suggest how i could do this.....some examples i have seen suggest that they are just scanning through the whole database which would perform even worse in my case. please help me on this i still dont understand how the hbase is working... -- View this message in context: http://www.nabble.com/Improving-hbase-performance-tp22060928p22064387.html Sent from the HBase User mailing list archive at Nabble.com.