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https://issues.apache.org/jira/browse/HDFS-57?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved HDFS-57.
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Resolution: Not A Problem
Not a problem in the current {{FSDataset}} operations (neither on branch-1).
> A Datanode's datadir could have lots of blocks in the top-level directory
> -------------------------------------------------------------------------
>
> Key: HDFS-57
> URL: https://issues.apache.org/jira/browse/HDFS-57
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: dhruba borthakur
>
> When a datanode restarts, it moves all the blocks from the datadir's tmp
> directory into the top-level of the datadir. It does not move these blocks
> into subdirectories of the datadir.
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