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https://issues.apache.org/jira/browse/HADOOP-4990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12670572#action_12670572
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Raghu Angadi commented on HADOOP-4990:
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I think this should be fixed sooner than later. Which branch it goes in would
depend on HADOOP-4663
> A Datanode's datadir could have lots of blocks in the top-level directory
> -------------------------------------------------------------------------
>
> Key: HADOOP-4990
> URL: https://issues.apache.org/jira/browse/HADOOP-4990
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.18.0
> 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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