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https://issues.apache.org/jira/browse/HDFS-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmytro Molkov updated HDFS-1071:
--------------------------------

    Status: Patch Available  (was: Open)

> 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.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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