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From "Wang Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1362) Provide volume management functionality for DataNode
Date Wed, 25 Jul 2012 02:51:37 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421959#comment-13421959
] 

Wang Xu commented on HDFS-1362:
-------------------------------

hi jiwan,

I know, I am still keeping look at this issue. But as current my job is not on hdfs, I cannot
keep track the updates in time. Sorry for that.

And for "if the failed disk still readable and the node has enouth space, it can migrate data
on the disks to other disks in the same node.", it was done in the original version, but was
removed in the posted version. Having discussed with some committer, we all thought it is
better to make the patch smaller and cleaner.

Thanks for your attention.

                
> Provide volume management functionality for DataNode
> ----------------------------------------------------
>
>                 Key: HDFS-1362
>                 URL: https://issues.apache.org/jira/browse/HDFS-1362
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: data-node
>    Affects Versions: 0.23.0
>            Reporter: Wang Xu
>            Assignee: Wang Xu
>             Fix For: 0.24.0
>
>         Attachments: DataNode Volume Refreshment in HDFS-1362.pdf, HDFS-1362.4_w7001.txt,
HDFS-1362.5.patch, HDFS-1362.6.patch, HDFS-1362.7.patch, HDFS-1362.8.patch, HDFS-1362.txt,
Provide_volume_management_for_DN_v1.pdf
>
>
> The current management unit in Hadoop is a node, i.e. if a node failed, it will be kicked
out and all the data on the node will be replicated.
> As almost all SATA controller support hotplug, we add a new command line interface to
datanode, thus it can list, add or remove a volume online, which means we can change a disk
without node decommission. Moreover, if the failed disk still readable and the node has enouth
space, it can migrate data on the disks to other disks in the same node.
> A more detailed design document will be attached.
> The original version in our lab is implemented against 0.20 datanode directly, and is
it better to implemented it in contrib? Or any other suggestion?

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