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https://issues.apache.org/jira/browse/HDFS-9063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15510683#comment-15510683
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Jing Zhao commented on HDFS-9063:
---------------------------------

[~manojg], the patch fixed a bug and did not change the semantic of {{du}} 
command. Before the patch, files that were created outside of a snapshot could 
be included when calculating the count/usage of the snapshot. The patch fixed 
this bug and there is such an example int the description.

For your case, maybe HDFS-8986 is the one related? Which Hadoop version are you 
using?

> Correctly handle snapshot path for getContentSummary
> ----------------------------------------------------
>
>                 Key: HDFS-9063
>                 URL: https://issues.apache.org/jira/browse/HDFS-9063
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>             Fix For: 2.8.0, 3.0.0-alpha1
>
>         Attachments: HDFS-9063.000.patch
>
>
> The current getContentSummary implementation does not take into account the 
> snapshot path, thus if we have the following ops:
> 1. create dirs /foo/bar
> 2. take snapshot s1 on /foo
> 3. create a 1 byte file /foo/bar/baz
> then "du /foo" and "du /foo/.snapshot/s1" can report same results for "bar", 
> which is incorrect since the 1 byte file is not included in snapshot s1.



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