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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6633) Support reading new data in a being written file until the file is closed
Date Mon, 22 Sep 2014 02:49:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14142845#comment-14142845
] 

Tsz Wo Nicholas Sze commented on HDFS-6633:
-------------------------------------------

[~vinayrpet], I agree that it is better to change DataTransferProtocol to support blocking
read.  Do you want to work on it?  Thank you in advance and assigning this to you!  If you
cannot work on it, please feel free to assign this back to me.

> Support reading new data in a being written file until the file is closed
> -------------------------------------------------------------------------
>
>                 Key: HDFS-6633
>                 URL: https://issues.apache.org/jira/browse/HDFS-6633
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: hdfs-client
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h6633_20140707.patch, h6633_20140708.patch
>
>
> When a file is being written, the file length keeps increasing.  If the file is opened
for read, the reader first gets the file length and then read only up to that length.  The
reader will not be able to read the new data written afterward.
> We propose adding a new feature so that readers will be able to read all the data until
the writer closes the file.



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