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https://issues.apache.org/jira/browse/HDFS-537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12750187#action_12750187
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Suresh Srinivas commented on HDFS-537:
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+1 for the patch.

> DataNode uses ReplicaBeingWritten to support dfs writes/hflush
> --------------------------------------------------------------
>
>                 Key: HDFS-537
>                 URL: https://issues.apache.org/jira/browse/HDFS-537
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node
>    Affects Versions: Append Branch
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: Append Branch
>
>         Attachments: exposeReplicaInfo.patch, exposeReplicaInfo1.patch
>
>
> This jira adds subdirectory "rbw" to data directory to support replicas 
> created on dfs writes/hflush, uses ReplicaBeingWritten to represent replicas 
> created on dfs writes/hflush, and some changes to make code more readable.

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