Return-Path: Delivered-To: apmail-hadoop-hdfs-issues-archive@minotaur.apache.org Received: (qmail 6156 invoked from network); 30 Mar 2010 00:29:50 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 30 Mar 2010 00:29:50 -0000 Received: (qmail 9696 invoked by uid 500); 30 Mar 2010 00:29:49 -0000 Delivered-To: apmail-hadoop-hdfs-issues-archive@hadoop.apache.org Received: (qmail 9658 invoked by uid 500); 30 Mar 2010 00:29:49 -0000 Mailing-List: contact hdfs-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hdfs-issues@hadoop.apache.org Delivered-To: mailing list hdfs-issues@hadoop.apache.org Received: (qmail 9607 invoked by uid 99); 30 Mar 2010 00:29:49 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 30 Mar 2010 00:29:49 +0000 X-ASF-Spam-Status: No, hits=-1168.5 required=10.0 tests=ALL_TRUSTED,AWL X-Spam-Check-By: apache.org Received: from [140.211.11.140] (HELO brutus.apache.org) (140.211.11.140) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 30 Mar 2010 00:29:48 +0000 Received: from brutus.apache.org (localhost [127.0.0.1]) by brutus.apache.org (Postfix) with ESMTP id BECB4234C4C8 for ; Tue, 30 Mar 2010 00:29:27 +0000 (UTC) Message-ID: <1020535813.566151269908967780.JavaMail.jira@brutus.apache.org> Date: Tue, 30 Mar 2010 00:29:27 +0000 (UTC) From: "Dmytro Molkov (JIRA)" To: hdfs-issues@hadoop.apache.org Subject: [jira] Commented: (HDFS-854) Datanode should scan devices in parallel to generate block report In-Reply-To: <1826844919.1261898129464.JavaMail.jira@brutus.apache.org> 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/HDFS-854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851177#action_12851177 ] Dmytro Molkov commented on HDFS-854: ------------------------------------ The errors in the build system again look like they are not related to the actual patch. Two errors in BlockScanner are java.lang.RuntimeException: java.util.zip.ZipException: error reading zip file at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:1715) at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:1529) at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:1475) at org.apache.hadoop.conf.Configuration.set(Configuration.java:596) at org.apache.hadoop.conf.Configuration.setLong(Configuration.java:731) at org.apache.hadoop.hdfs.TestDatanodeBlockScanner.blockCorruptionRecoveryPolicy(TestDatanodeBlockScanner.java:277) at org.apache.hadoop.hdfs.TestDatanodeBlockScanner.testBlockCorruptionRecoveryPolicy(TestDatanodeBlockScanner.java:269) and there is one more error with HDFSProxy which cannot have anything to do with my code changes. > Datanode should scan devices in parallel to generate block report > ----------------------------------------------------------------- > > Key: HDFS-854 > URL: https://issues.apache.org/jira/browse/HDFS-854 > Project: Hadoop HDFS > Issue Type: Improvement > Components: data-node > Affects Versions: 0.22.0 > Reporter: dhruba borthakur > Assignee: Dmytro Molkov > Fix For: 0.22.0 > > Attachments: HDFS-854-2.patch, HDFS-854.patch, HDFS-854.patch.1 > > > A Datanode should scan its disk devices in parallel so that the time to generate a block report is reduced. This will reduce the startup time of a cluster. > A datanode has 12 disk (each of 1 TB) to store HDFS blocks. There is a total of 150K blocks on these 12 disks. It takes the datanode upto 20 minutes to scan these devices to generate the first block report. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.