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