Return-Path: Delivered-To: apmail-hadoop-core-commits-archive@www.apache.org Received: (qmail 74165 invoked from network); 2 Apr 2009 14:38:12 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 2 Apr 2009 14:38:12 -0000 Received: (qmail 15287 invoked by uid 500); 2 Apr 2009 14:38:12 -0000 Delivered-To: apmail-hadoop-core-commits-archive@hadoop.apache.org Received: (qmail 15233 invoked by uid 500); 2 Apr 2009 14:38:12 -0000 Mailing-List: contact core-commits-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: core-dev@hadoop.apache.org Delivered-To: mailing list core-commits@hadoop.apache.org Received: (qmail 15224 invoked by uid 99); 2 Apr 2009 14:38:12 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 02 Apr 2009 14:38:12 +0000 X-ASF-Spam-Status: No, hits=-2000.0 required=10.0 tests=ALL_TRUSTED X-Spam-Check-By: apache.org Received: from [192.87.106.226] (HELO aurora.apache.org) (192.87.106.226) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 02 Apr 2009 14:38:11 +0000 Received: from aurora.apache.org (localhost [127.0.0.1]) by aurora.apache.org (8.13.8+Sun/8.13.8) with ESMTP id n32EboBJ013896 for ; Thu, 2 Apr 2009 14:37:50 GMT Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Apache Wiki To: core-commits@hadoop.apache.org Date: Thu, 02 Apr 2009 14:37:50 -0000 Message-ID: <20090402143750.13769.38909@aurora.apache.org> Subject: [Hadoop Wiki] Trivial Update of "Hbase/DesignOverview" by EvgenyRyabitskiy X-Virus-Checked: Checked by ClamAV on apache.org Dear Wiki user, You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification. The following page has been changed by EvgenyRyabitskiy: http://wiki.apache.org/hadoop/Hbase/DesignOverview ------------------------------------------------------------------------------ [[Anchor(datamodel)]] = Data Model = - Applications store data rows in labeled tables. A data row has a sortable row key and an arbitrary number of columns. The table is stored sparsely, so that rows in the same table can have widely varying numbers of columns. + Applications store data rows in labeled tables. A data row has a sortable row key and an arbitrary number of columns. The table is stored sparsely, so that rows in the same table can have widely varying numbers of columns. + + HBase is three dimensional sorted map. It maps from Cartesian product of row key, column key and a timestamp to cell value: + + (row:byte[] x column:byte[] x timestamp:Long) -> byte[] A column name has the form ''":