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From "Wang Xu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1362) Provide volume management functionality for DataNode
Date Sun, 05 Dec 2010 14:16:14 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1362?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wang Xu updated HDFS-1362:
--------------------------

    Attachment: HDFS-1362.4_w7001.txt

I updated the patch based on the reconfiguration mechanism provided by HADOOP-7001. And now
it only tries to add  the new dirs in configuration files and is triggered by configuration
update.

> 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
>            Reporter: Wang Xu
>            Assignee: Wang Xu
>         Attachments: HDFS-1362.4_w7001.txt, 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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