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https://issues.apache.org/jira/browse/HDFS-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16124974#comment-16124974
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leib commented on HDFS-376:
---------------------------

i don't think it's a additional rpc to nn but instead of dn.u can reference 
from DFSClient.DFSInputStream#openInfo().
but u if there are many files under the dir u wanted to list,that means this op 
will cost certain overhead to complete it.

> FileSystem.listStatus should report the current length of a file if it has 
> been sync'd
> --------------------------------------------------------------------------------------
>
>                 Key: HDFS-376
>                 URL: https://issues.apache.org/jira/browse/HDFS-376
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Jim Kellerman
>
> If a writer calls sync(), it should be possible to get the current file size 
> via FileSystem.listStatus, rather than listStatus returning 0 for the file 
> size until the file lease times out or the file is closed.



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