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Message-ID: <10460477.33191274326974688.JavaMail.jira@thor>
Date: Wed, 19 May 2010 23:42:54 -0400 (EDT)
From: "Dmytro Molkov (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-1071) savenamespace should write the fsimage
 to all configured fs.name.dir in parallel
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     [ https://issues.apache.org/jira/browse/HDFS-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmytro Molkov updated HDFS-1071:
--------------------------------

    Attachment: HDFS-1071.3.patch

Added a check that we have more than 1 checksum of image files, so that the test is valid.

> savenamespace should write the fsimage to all configured fs.name.dir in parallel
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-1071
>                 URL: https://issues.apache.org/jira/browse/HDFS-1071
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: dhruba borthakur
>            Assignee: Dmytro Molkov
>         Attachments: HDFS-1071.2.patch, HDFS-1071.3.patch, HDFS-1071.patch
>
>
> If you have a large number of files in HDFS, the fsimage file is very big. When the namenode restarts, it writes a copy of the fsimage to all directories configured in fs.name.dir. This takes a long time, especially if there are many directories in fs.name.dir. Make the NN write the fsimage to all these directories in parallel.

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