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Posted to hdfs-dev@hadoop.apache.org by "dhruba borthakur (JIRA)" <ji...@apache.org> on 2009/12/27 09:17:29 UTC
[jira] Created: (HDFS-855) namenode can save images in parallel to
all directories in fs.name.dir
namenode can save images in parallel to all directories in fs.name.dir
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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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[jira] Resolved: (HDFS-855) namenode can save images in parallel to
all directories in fs.name.dir
Posted by "Jakob Homan (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HDFS-855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jakob Homan resolved HDFS-855.
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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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