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From "Konstantin Boudnik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-570) When opening a file for read, make the file length avaliable to client.
Date Fri, 25 Sep 2009 19:09:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12759705#action_12759705
] 

Konstantin Boudnik commented on HDFS-570:
-----------------------------------------

The test method is public thus some JavaDoc would be in order. Also, for the sake for future
reader unfamiliar with particulars of append implementation, I'd suggest to add a minimal
comments on the test assumptions expressed through {{assert}} invocations.

There's some commented statement left - shall they be removed?

+1 otherwise.

> 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
>
>
> 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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