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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-570) When opening a file for read, make the file length avaliable to client.
Date Wed, 14 Aug 2013 04:44:48 GMT

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

Tsz Wo (Nicholas), SZE updated HDFS-570:
----------------------------------------

    Release Note: In order to support read consistency, get last block length from a data-node
when opening a file being written to. 
    
> 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_20090925b.patch,
h570_20090925c.patch, h570_20090925.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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