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https://issues.apache.org/jira/browse/HDFS-1121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12892255#action_12892255
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Steve Loughran commented on HDFS-1121:
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The DN should do placement but we need to be able to see where stuff has been
placed as a precursor to any attempts to manage placement better. Ideally in
some web ui that shows how balanced/unbalanced servers have become
Clients need to be able to do it so when your sort of 150TB of data takes
longer than the spreadsheet says, your ops team need to be confident that the
problem isn't due to back block placement on your 12 HDD servers, but to
something else (networking, etc).
> Allow HDFS client to measure distribution of blocks across devices for a
> specific DataNode
> ------------------------------------------------------------------------------------------
>
> Key: HDFS-1121
> URL: https://issues.apache.org/jira/browse/HDFS-1121
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs client
> Reporter: Jeff Hammerbacher
>
> As discussed on the mailing list, it would be useful if the DfsClient could
> measure the distribution of blocks across devices for an individual DataNode.
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