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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1071) savenamespace should write the fsimage to all configured fs.name.dir in parallel
Date Fri, 12 Nov 2010 01:39:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931298#action_12931298
] 

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

Looks like Hudson didn't make it all the way through due to an unrelated error: https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/3/console
 Dmytro, can you post test and test-patch results and then I'll commit.  Thanks.

> 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-1071.7.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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