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https://issues.apache.org/jira/browse/HDFS-4772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13644192#comment-13644192
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Suresh Srinivas commented on HDFS-4772:
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This is very useful. +1.
                
> Add number of children in HdfsFileStatus
> ----------------------------------------
>
>                 Key: HDFS-4772
>                 URL: https://issues.apache.org/jira/browse/HDFS-4772
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>            Priority: Minor
>
> This JIRA is to track the change to return the number of children for a 
> directory, so the client doesn't need to make a getListing() call to 
> calculate the number of dirents. This makes it convenient for the client to 
> check directory size change.

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