Return-Path: Delivered-To: apmail-hadoop-hbase-user-archive@locus.apache.org Received: (qmail 57293 invoked from network); 10 Oct 2008 10:53:52 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 10 Oct 2008 10:53:52 -0000 Received: (qmail 39572 invoked by uid 500); 10 Oct 2008 10:53:50 -0000 Delivered-To: apmail-hadoop-hbase-user-archive@hadoop.apache.org Received: (qmail 39555 invoked by uid 500); 10 Oct 2008 10:53:50 -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 39544 invoked by uid 99); 10 Oct 2008 10:53:50 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 10 Oct 2008 03:53:50 -0700 X-ASF-Spam-Status: No, hits=0.1 required=10.0 tests=DNS_FROM_SECURITYSAGE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: local policy) Received: from [210.176.12.234] (HELO Exchange.starline.hongkong) (210.176.12.234) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 10 Oct 2008 10:52:44 +0000 Received: from [127.0.0.1] ([83.19.233.210]) by Exchange.starline.hongkong with Microsoft SMTPSVC(6.0.3790.3959); Fri, 10 Oct 2008 18:53:00 +0800 Message-ID: <48EF3408.6030901@starline.hk> Date: Fri, 10 Oct 2008 12:52:56 +0200 From: Krzysztof Szlapinski User-Agent: Thunderbird 2.0.0.17 (Windows/20080914) MIME-Version: 1.0 To: hbase-user@hadoop.apache.org Subject: Re: Hbase / Hadoop Tuning References: <48E51557.5040604@duboce.net> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 10 Oct 2008 10:53:01.0508 (UTC) FILETIME=[5D5DA840:01C92AC6] X-Virus-Checked: Checked by ClamAV on apache.org Jim Kellerman (POWERSET) wrote: > Using a single client will also limit write performance. > Even if the client is multi-threaded, there is a big giant lock > in the RPC mechanism which prevents concurrent requests (This > is something we plan to fix in the future). > What do you mean by "hbase client"? Do you mean the instances of HBaseAdmin and HTable (any other?). krzysiek