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From "Wang Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1362) Provide volume management functionality for DataNode
Date Wed, 23 Jul 2014 02:24:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14071277#comment-14071277

Wang Xu commented on HDFS-1362:

Thank you [~eddyxu],

I had tried on this, but I am not working on Hadoop for years and src organized changed significantly
since .22.

It is appreciated if you can re-active this patch.

> 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: datanode
>    Affects Versions: 0.23.0
>            Reporter: Wang Xu
>            Assignee: Wang Xu
>         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,
> 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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