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https://issues.apache.org/jira/browse/HADOOP-4761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653395#action_12653395
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Konstantin Shvachko commented on HADOOP-4761:
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> I was looking for a utility which would tell if a block is corrupt or not
> given the block-id OR given a datanode and a block-id/file
Why would you need that?
The problem here is that we do not have file system api's to access individual
blocks. Which gives us (developers) flexibility to change block-ids if we need
to. E.g. it was particularly changed recently when appends were introduced.
What you propose is a backdoor to HDFS internals, which in my opinion should
not be supported at all.
> Tool to give the block location and to check if the block at a given datanode
> is corrupt or not
> -----------------------------------------------------------------------------------------------
>
> Key: HADOOP-4761
> URL: https://issues.apache.org/jira/browse/HADOOP-4761
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Reporter: Ramya R
> Priority: Minor
> Fix For: 0.20.0
>
>
> It would be useful if we could have a command line tool which would list out
> the location of all the replicas of a block given a block-id/filename. Also,
> an utility to check if the block at a given datanode is corrupt or not would
> be of great help in managing the cluster.
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