Return-Path: Delivered-To: apmail-hadoop-mapreduce-issues-archive@minotaur.apache.org Received: (qmail 39340 invoked from network); 9 Dec 2010 01:20:27 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 9 Dec 2010 01:20:27 -0000 Received: (qmail 7687 invoked by uid 500); 9 Dec 2010 01:20:27 -0000 Delivered-To: apmail-hadoop-mapreduce-issues-archive@hadoop.apache.org Received: (qmail 7615 invoked by uid 500); 9 Dec 2010 01:20:27 -0000 Mailing-List: contact mapreduce-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: mapreduce-issues@hadoop.apache.org Delivered-To: mailing list mapreduce-issues@hadoop.apache.org Received: (qmail 7607 invoked by uid 99); 9 Dec 2010 01:20:27 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 09 Dec 2010 01:20:27 +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; Thu, 09 Dec 2010 01:20:25 +0000 Received: from thor (localhost [127.0.0.1]) by thor.apache.org (8.13.8+Sun/8.13.8) with ESMTP id oB91K31h002249 for ; Thu, 9 Dec 2010 01:20:03 GMT Message-ID: <33283709.28941291857603307.JavaMail.jira@thor> Date: Wed, 8 Dec 2010 20:20:03 -0500 (EST) From: "Scott Chen (JIRA)" To: mapreduce-issues@hadoop.apache.org Subject: [jira] Updated: (MAPREDUCE-1831) BlockPlacement policy for RAID MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 X-Virus-Checked: Checked by ClamAV on apache.org [ https://issues.apache.org/jira/browse/MAPREDUCE-1831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Scott Chen updated MAPREDUCE-1831: ---------------------------------- Fix Version/s: (was: 0.22.0) 0.23.0 Affects Version/s: (was: 0.22.0) 0.23.0 Status: Patch Available (was: Open) > BlockPlacement policy for RAID > ------------------------------ > > Key: MAPREDUCE-1831 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-1831 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: contrib/raid > Affects Versions: 0.23.0 > Reporter: Scott Chen > Assignee: Scott Chen > Fix For: 0.23.0 > > Attachments: MAPREDUCE-1831-v2.txt, MAPREDUCE-1831.20100610.txt, MAPREDUCE-1831.txt, MAPREDUCE-1831.v1.1.txt > > > Raid introduce the new dependency between blocks within a file. > The blocks help decode each other. Therefore we should avoid put them on the same machine. > The proposed BlockPlacementPolicy does the following > 1. When writing parity blocks, it avoid the parity blocks and source blocks sit together. > 2. When reducing replication number, it deletes the blocks that sits with other dependent blocks. > 3. It does not change the way we write normal files. It only has different behavior when processing raid files. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.