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Posted to hdfs-dev@hadoop.apache.org by "Vinayakumar B (JIRA)" <ji...@apache.org> on 2014/09/19 19:47:34 UTC

[jira] [Resolved] (HDFS-7099) Support polling for more data from a write-in-progress file using same DFSInputStream

     [ https://issues.apache.org/jira/browse/HDFS-7099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinayakumar B resolved HDFS-7099.
---------------------------------
    Resolution: Duplicate

Same discussion going on in HDFS-6633. So duplicating it.

> Support polling for more data from a write-in-progress file using same DFSInputStream
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-7099
>                 URL: https://issues.apache.org/jira/browse/HDFS-7099
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>
> Currently DFSInputStream can read only till the bytes written which were written by the time of Opening it for reading. 
> But, later there can be more bytes written to same file.
> If client expects more data to  be available, then client can poll it continuously for more data without re-opening the stream.
> One simple example use case for this is tailing logs files.
> Currently LocalFileSystem supports this.



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