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From "Wang Xu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1362) Provide volume management functionality for DataNode
Date Sun, 29 Aug 2010 15:53:54 GMT
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

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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