Sean Mackrory created HDFS-10797:
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             Summary: 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


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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