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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-544) Add a "rbw" sub directory to DataNode data directory
Date Thu, 20 Aug 2009 01:39:14 GMT

    [ 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:
------------------------------------

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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