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https://issues.apache.org/jira/browse/HDFS-570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE updated HDFS-570:
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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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