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https://issues.apache.org/jira/browse/HDFS-1049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12847676#action_12847676
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Allen Wittenauer commented on HDFS-1049:
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This goes back to the whole "traversing the file system" issue that impacts 
lots of other tools and common ops procedures. It takes *forever* on a large fs 
plus adds to the NN load when we could just have the NN spit out the answer to 
the question directly.  [This would be great functionality for the mythical 
hadoop dfs -find command.]

> utility to list all files less than X replication
> -------------------------------------------------
>
>                 Key: HDFS-1049
>                 URL: https://issues.apache.org/jira/browse/HDFS-1049
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: tools
>    Affects Versions: 0.20.2
>            Reporter: Allen Wittenauer
>
> It would be great to have a utility that lists all files that have a 
> replication less than X.  While fsck provides this output and it isn't that 
> tricky to parse, it would still be nice if Hadoop had this functionality out 
> of the box.

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