Return-Path: Delivered-To: apmail-hbase-issues-archive@www.apache.org Received: (qmail 54428 invoked from network); 11 Aug 2010 05:26:47 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 11 Aug 2010 05:26:47 -0000 Received: (qmail 16858 invoked by uid 500); 11 Aug 2010 05:26:47 -0000 Delivered-To: apmail-hbase-issues-archive@hbase.apache.org Received: (qmail 16794 invoked by uid 500); 11 Aug 2010 05:26:45 -0000 Mailing-List: contact issues-help@hbase.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Delivered-To: mailing list issues@hbase.apache.org Received: (qmail 16779 invoked by uid 99); 11 Aug 2010 05:26:44 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 11 Aug 2010 05:26:44 +0000 X-ASF-Spam-Status: No, hits=-2000.0 required=10.0 tests=ALL_TRUSTED X-Spam-Check-By: apache.org Received: from [140.211.11.22] (HELO thor.apache.org) (140.211.11.22) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 11 Aug 2010 05:26:43 +0000 Received: from thor (localhost [127.0.0.1]) by thor.apache.org (8.13.8+Sun/8.13.8) with ESMTP id o7B5QNW1005818 for ; Wed, 11 Aug 2010 05:26:23 GMT Message-ID: <6840205.269321281504383299.JavaMail.jira@thor> Date: Wed, 11 Aug 2010 01:26:23 -0400 (EDT) From: "HBase Review Board (JIRA)" To: issues@hbase.apache.org Subject: [jira] Commented: (HBASE-50) Snapshot of table MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/HBASE-50?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897146#action_12897146 ] HBase Review Board commented on HBASE-50: ----------------------------------------- Message from: "Ted Yu" ----------------------------------------------------------- This is an automatically generated e-mail. To reply, visit: http://review.cloudera.org/r/467/#review829 ----------------------------------------------------------- src/main/java/org/apache/hadoop/hbase/io/Reference.java I think the current code is backward compatible. Boolean value of true is interpreted as TOP, value of false is BOTTOM. Since ENTIRE is introduced, this code is not backward compatible. See: http://download.oracle.com/javase/1.4.2/docs/api/java/io/DataOutput.html#writeBoolean%28boolean%29 - Ted > Snapshot of table > ----------------- > > Key: HBASE-50 > URL: https://issues.apache.org/jira/browse/HBASE-50 > Project: HBase > Issue Type: New Feature > Reporter: Billy Pearson > Assignee: Li Chongxin > Priority: Minor > Attachments: HBase Snapshot Design Report V2.pdf, HBase Snapshot Design Report V3.pdf, HBase Snapshot Implementation Plan.pdf, Snapshot Class Diagram.png > > > Havening an option to take a snapshot of a table would be vary useful in production. > What I would like to see this option do is do a merge of all the data into one or more files stored in the same folder on the dfs. This way we could save data in case of a software bug in hadoop or user code. > The other advantage would be to be able to export a table to multi locations. Say I had a read_only table that must be online. I could take a snapshot of it when needed and export it to a separate data center and have it loaded there and then i would have it online at multi data centers for load balancing and failover. > I understand that hadoop takes the need out of havening backup to protect from failed servers, but this does not protect use from software bugs that might delete or alter data in ways we did not plan. We should have a way we can roll back a dataset. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.