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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 Mon, 17 Aug 2009 23:54:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12744298#action_12744298
] 

Hairong Kuang commented on HDFS-544:
------------------------------------

The current datanode data directory layout  on each volume is
{noformat}
current
tmp
detach
{noformat}
I plan to change it to be
{noformat}
current
      finalized   // store finalized replicas
      rbw          // store unfinalized replicas
tmp // store temporary replicas
{noformat}

"rbw" stays under "current" so it is automatically included in a snapshot during upgrading.
Finalized replicas used to be storeed under "current" and now they are moved to the subdirectory
"finalized".

How to handle "detach" directory and detaching replicas are explained in HDFS-550. 

> 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
>
>
> Add a "rbw" sub directory to DataNode to persist RBW, RWR, and RUR replicas.

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