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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HDFS-855) namenode can save images in parallel to all directories in fs.name.dir
Date Thu, 30 Sep 2010 23:43:36 GMT

     [ https://issues.apache.org/jira/browse/HDFS-855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jakob Homan resolved HDFS-855.
------------------------------

    Resolution: Duplicate

> namenode can save images in parallel to all directories in fs.name.dir
> ----------------------------------------------------------------------
>
>                 Key: HDFS-855
>                 URL: https://issues.apache.org/jira/browse/HDFS-855
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: dhruba borthakur
>
> The namenode restart times can be reduced if the namenode can save its image to multiple
directories (specified in fs.name.dir) in parallel.
> The NN has a 6 GB fsimage and 1 MB edits file. The NN needed 10 minutes to load fsimage/edits
into memory. It needs 7 minutes to read the 6 GB image. There are two directories in fs.name.dir.
 it takes about 2 minute to save the image into first directory and another 2 minutes to save
the image to the second directory. 

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