From hdfs-issues-return-32128-apmail-hadoop-hdfs-issues-archive=hadoop.apache.org@hadoop.apache.org Sat Jan 14 00:59:01 2012 Return-Path: X-Original-To: apmail-hadoop-hdfs-issues-archive@minotaur.apache.org Delivered-To: apmail-hadoop-hdfs-issues-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 947059D95 for ; Sat, 14 Jan 2012 00:59:01 +0000 (UTC) Received: (qmail 97272 invoked by uid 500); 14 Jan 2012 00:59:01 -0000 Delivered-To: apmail-hadoop-hdfs-issues-archive@hadoop.apache.org Received: (qmail 97205 invoked by uid 500); 14 Jan 2012 00:59:00 -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 97197 invoked by uid 99); 14 Jan 2012 00:59:00 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 14 Jan 2012 00:59:00 +0000 X-ASF-Spam-Status: No, hits=-2000.0 required=5.0 tests=ALL_TRUSTED,T_RP_MATCHES_RCVD X-Spam-Check-By: apache.org Received: from [140.211.11.116] (HELO hel.zones.apache.org) (140.211.11.116) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 14 Jan 2012 00:58:59 +0000 Received: from hel.zones.apache.org (hel.zones.apache.org [140.211.11.116]) by hel.zones.apache.org (Postfix) with ESMTP id 64A0814BD12 for ; Sat, 14 Jan 2012 00:58:39 +0000 (UTC) Date: Sat, 14 Jan 2012 00:58:39 +0000 (UTC) From: "Eli Collins (Commented) (JIRA)" To: hdfs-issues@hadoop.apache.org Message-ID: <53325993.40146.1326502719413.JavaMail.tomcat@hel.zones.apache.org> In-Reply-To: <951899290.32159.1326324110086.JavaMail.tomcat@hel.zones.apache.org> Subject: [jira] [Commented] (HDFS-2782) HA: Support multiple shared edits dirs 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-2782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186039#comment-13186039 ] Eli Collins commented on HDFS-2782: ----------------------------------- #1 Expecting both independent failures (eg the dirs are one two separate mounts with different underlying volumes may fail independently) and dependent failures (if the connection to the same server is severed for example). #2 Yes, a 2nd or 3rd shared dir is just like the first. Eg if the primary or standby marked a shared dir as bad it and the standby could switch to another. > HA: Support multiple shared edits dirs > -------------------------------------- > > Key: HDFS-2782 > URL: https://issues.apache.org/jira/browse/HDFS-2782 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: ha > Affects Versions: HA branch (HDFS-1623) > Reporter: Eli Collins > Assignee: Eli Collins > > Supporting multiple shared dirs will improve availability (eg see HDFS-2769). You may want to use multiple shared dirs on a single filer (eg for better fault isolation) or because you want to use multiple filers/mounts. Per HDFS-2752 (and HDFS-2735) we need to do things like use the JournalSet in EditLogTailer and add tests. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira