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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1362) Provide volume management functionality for DataNode
Date Mon, 21 Mar 2011 22:43:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009456#comment-13009456
] 

Sanjay Radia commented on HDFS-1362:
------------------------------------


Steps 1 and 2 are done by the operator and step 3 is:
* invoke a referesh volumes command on the DNs that re-examines the the existing config.
This Jira will add this new refresh volumes command.

Correct?
That sound fine. 


> 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: 0.23.0
>
>         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.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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