Provide volume management functionality for DataNode
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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
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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