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https://issues.apache.org/jira/browse/HDFS-878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12798284#action_12798284
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dhruba borthakur commented on HDFS-878:
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I agree with Eli. We should not change FileStatus to carry any information of 
whether the file is open for write or not.

I also like the proposal of having a DFSFileStatus (this is going back to the 
old days, heh?)

> FileStatus should have a field "isUnderConstruction"
> ----------------------------------------------------
>
>                 Key: HDFS-878
>                 URL: https://issues.apache.org/jira/browse/HDFS-878
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>
> Currently DFSClient has no way to know whether a file is under construction 
> or not, unless we open the file and get locatedBlocks (which is much more 
> costly).
> However, the namenode knows whether each INode is under construction or not.
> We should expose that information from NameNode.getListing(), to 
> DFSClient.listPaths(), to DistributedFileSystem.listStatus().
> We should also expose that information through DFSInputStream and 
> DFSDataInputStream if not there yet.

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