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https://issues.apache.org/jira/browse/HDFS-544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12745272#action_12745272
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Hairong Kuang commented on HDFS-544:
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After talking to Raghu and Nicholas, I realize that a datanode does not need to
read all bytes of a rbw replica to get its valid length. Instead, it needs to
read only the last crc chunk. So the use of BlockSender can be removed.
> Add a "rbw" sub directory to DataNode data directory
> ----------------------------------------------------
>
> Key: HDFS-544
> URL: https://issues.apache.org/jira/browse/HDFS-544
> 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: datanodeOnDiskLayout.patch
>
>
> Add a "rbw" sub directory to DataNode to persist RBW, RWR, and RUR replicas.
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