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https://issues.apache.org/jira/browse/HDFS-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12923275#action_12923275
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Konstantin Shvachko commented on HDFS-1071:
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This is what we discussed with Dmytro in details above. As I understood he is
not holding the FSNamesystem lock for writing ALL the images, therefore they
can be different. And safe mode does not guarantee the tree state is not
changing. Could you please verify this. If the images are the same I'm fine
with the implementation.
> 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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