[jira] Resolved: (HDFS-570) When opening a file for read, make the file length avaliable to client.

["Konstantin Shvachko (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Shvachko resolved HDFS-570.
--------------------------------------

      Resolution: Fixed
    Hadoop Flags: [Incompatible change, Reviewed]  (was: [Incompatible change])

I just committed this. Thank you Nicholas.

> When opening a file for read, make the file length avaliable to client.
> -----------------------------------------------------------------------
>
>                 Key: HDFS-570
>                 URL: https://issues.apache.org/jira/browse/HDFS-570
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs client
>    Affects Versions: Append Branch
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: Append Branch
>
>         Attachments: h570_20090828.patch, h570_20090922.patch, h570_20090924.patch, h570_20090925.patch, h570_20090925b.patch, h570_20090925c.patch, h570_20090926.patch, h570_20090926.patch
>
>
> In order to support read consistency, DFSClient needs the file length at the file opening time.  In the current implmentation, DFSClient obtains the file length at the file opening time but the length is inaccurate if the file is being written.
> For more details, see Section 4 in the [append design doc|https://issues.apache.org/jira/secure/attachment/12415768/appendDesign2.pdf].

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