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https://issues.apache.org/jira/browse/HDFS-565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16880128#comment-16880128
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wangyi commented on HDFS-565:
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Why do you want to add this parameter (Block previous) in addBlock and file
close? how to compatible with pre version?
> 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, namenode
> Affects Versions: Append Branch
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Priority: Major
> Fix For: Append Branch
>
> Attachments: CommitBlock.patch, CommitBlock.patch, HDFS-565.aj.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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