Xiao Chen commented on HDFS-10797:

Thanks Sean for revving! Patch 3 looks great to me.

Hi [~yzhangal] and [~jingzhao], could you please take a final look since you're 
more familiar with snapshots? Thanks in advance.

> Disk usage summary of snapshots causes renamed blocks to get counted twice
> --------------------------------------------------------------------------
>                 Key: HDFS-10797
>                 URL: https://issues.apache.org/jira/browse/HDFS-10797
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Sean Mackrory
>            Assignee: Sean Mackrory
>         Attachments: HDFS-10797.001.patch, HDFS-10797.002.patch, 
> HDFS-10797.003.patch
> DirectoryWithSnapshotFeature.computeContentSummary4Snapshot calculates how 
> much disk usage is used by a snapshot by tallying up the files in the 
> snapshot that have since been deleted (that way it won't overlap with regular 
> files whose disk usage is computed separately). However that is determined 
> from a diff that shows moved (to Trash or otherwise) or renamed files as a 
> deletion and a creation operation that may overlap with the list of blocks. 
> Only the deletion operation is taken into consideration, and this causes 
> those blocks to get represented twice in the disk usage tallying.

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