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https://issues.apache.org/jira/browse/HADOOP-334?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko resolved HADOOP-334.
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Resolution: Duplicate
> Redesign the dfs namespace datastructures to be copy on write
> -------------------------------------------------------------
>
> Key: HADOOP-334
> URL: https://issues.apache.org/jira/browse/HADOOP-334
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.4.0
> Reporter: Owen O'Malley
> Assignee: Konstantin Shvachko
>
> The namespace datastructures should be copy on write so that the namespace
> does not need to be completely locked down from user changes while the
> checkpoint is being made.
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