Return-Path: X-Original-To: apmail-hbase-user-archive@www.apache.org Delivered-To: apmail-hbase-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 24979CD8B for ; Mon, 3 Jun 2013 08:31:21 +0000 (UTC) Received: (qmail 2356 invoked by uid 500); 3 Jun 2013 08:31:18 -0000 Delivered-To: apmail-hbase-user-archive@hbase.apache.org Received: (qmail 2191 invoked by uid 500); 3 Jun 2013 08:31:18 -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 2183 invoked by uid 99); 3 Jun 2013 08:31:17 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 03 Jun 2013 08:31:17 +0000 X-ASF-Spam-Status: No, hits=-5.0 required=5.0 tests=RCVD_IN_DNSWL_HI,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of raymond.liu@intel.com designates 134.134.136.24 as permitted sender) Received: from [134.134.136.24] (HELO mga09.intel.com) (134.134.136.24) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 03 Jun 2013 08:31:12 +0000 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga102.jf.intel.com with ESMTP; 03 Jun 2013 01:28:41 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,791,1363158000"; d="scan'208";a="347281924" Received: from fmsmsx106.amr.corp.intel.com ([10.19.9.37]) by orsmga002.jf.intel.com with ESMTP; 03 Jun 2013 01:30:51 -0700 Received: from fmsmsx151.amr.corp.intel.com (10.19.17.220) by FMSMSX106.amr.corp.intel.com (10.19.9.37) with Microsoft SMTP Server (TLS) id 14.3.123.3; Mon, 3 Jun 2013 01:30:51 -0700 Received: from shsmsx102.ccr.corp.intel.com (10.239.4.154) by FMSMSX151.amr.corp.intel.com (10.19.17.220) with Microsoft SMTP Server (TLS) id 14.3.123.3; Mon, 3 Jun 2013 01:30:51 -0700 Received: from shsmsx101.ccr.corp.intel.com ([169.254.1.243]) by SHSMSX102.ccr.corp.intel.com ([169.254.2.93]) with mapi id 14.03.0123.003; Mon, 3 Jun 2013 16:30:50 +0800 From: "Liu, Raymond" To: "user@hbase.apache.org" Subject: what's the typical scan latency? Thread-Topic: what's the typical scan latency? Thread-Index: Ac5gNAydcmJ3HeReSjWg+p4UtcCruw== Date: Mon, 3 Jun 2013 08:30:49 +0000 Message-ID: <391D65D0EBFC9B4B95E117F72A360F1A01044C34@SHSMSX101.ccr.corp.intel.com> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.239.127.40] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Virus-Checked: Checked by ClamAV on apache.org Hi If all the data is already in RS blockcache. Then what's the typical scan latency for scan a few rows from a say severa= l GB table ( with dozens of regions ) on a small cluster with say 4 RS ? A few ms? Tens of ms? Or more? Best Regards, Raymond Liu