[
https://issues.apache.org/jira/browse/HDFS-1362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13007016#comment-13007016
]
Sanjay Radia commented on HDFS-1362:
------------------------------------
@Todd> Having the ability to add/remove volumes via RPC has the issue that the
changes are not reflected in the config file ..... So, rather than providing
add/list/remove APIs, we decided to simply add a "refresh" API.
I agree with Todd's comment that we don't want to change the config or do
things that are different from the config.
There is a related Jiras on "removing" failed disk.
There is also the additional complexity of formatting the drives and mounting
them. Are you assuming that this has been done prior to the refresh?
Does Redhat deal with hot pluggable disks?
> 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?
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
