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https://issues.apache.org/jira/browse/HDFS-565?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko resolved HDFS-565.
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      Resolution: Fixed
    Hadoop Flags: [Reviewed]

I just committed this.

> Introduce block committing logic during new block allocation and file close.
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-565
>                 URL: https://issues.apache.org/jira/browse/HDFS-565
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs client, name-node
>    Affects Versions: Append Branch
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: Append Branch
>
>         Attachments: CommitBlock.patch, CommitBlock.patch
>
>
> {{ClientProtocol}} methods {{addBlock()}} and {{complete()}} need to include 
> additional parameter - a block, which has been successfully written to 
> data-nodes. By sending this block to the name-node the client confirms the 
> generation stamp of the block and its length. The block on the name-node 
> changes its state to committed and will become complete as long as one of the 
> finalized replicas reported by data-nodes.

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