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https://issues.apache.org/jira/browse/HADOOP-17155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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angerszhu resolved HADOOP-17155.
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Resolution: Not A Problem
> DF implementation of CachingGetSpaceUsed makes DFS Used size not correct
> ------------------------------------------------------------------------
>
> Key: HADOOP-17155
> URL: https://issues.apache.org/jira/browse/HADOOP-17155
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: angerszhu
> Priority: Minor
> Attachments: HADOOP-17155.1.patch
>
>
> When we calculate DN's storage used, we add each Volume's used size
> together and each volume's size comes from it's BP's size.
> When we use DF instead of DU, we know that DF check disk space usage (not
> disk size of a directory). so when check BP dir path, What you're actually
> checking is the corresponding disk directory space.
>
> When we use this with federation, under each volume may have more than one
> BP, each BP return it's corresponding disk directory space.
>
> If we have two BP under one volume, we will make DN's storage info's Used
> size double than real size.
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