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https://issues.apache.org/jira/browse/HADOOP-4763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lei Xu updated HADOOP-4763:
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    Attachment: fsck.patch

I refactory the code to let manually fsck has better outputs( similar with 
original one) , and share parts of code with original fsck. 

It is also need test. 


> Support manually fsck in DataNode
> ---------------------------------
>
>                 Key: HADOOP-4763
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4763
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Lei Xu
>         Attachments: fsck.patch, fsck.patch, HADOOP-4763.patch
>
>
> Now DataNode only support scan all blocks periodically.  Our site need a tool 
> to check some blocks and files manually. 
> My current design is to add a parameter to DFSck to indicate deeply and 
> manually fsck request, then let NameNode collect property block identifies 
> and sent them to associated DataNode. 
> I'll let DataBlockScanner runs in two ways: periodically ( original one ) and 
> manually. 
> Any suggestions on this are welcome. 

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