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Date: Mon, 25 Oct 2010 20:36:21 -0400 (EDT)
From: "Jakob Homan (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (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:comment-tabpanel&focusedCommentId=12924800#action_12924800 ] 

Jakob Homan commented on HDFS-1071:
-----------------------------------

Also, in TestParallelImageWrite.java, there is an unused import (URI) and an unused local variable (imageIndex) that should be cleaned up.

> 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-1071.4.patch, HDFS-1071.5.patch, HDFS-1071.6.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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