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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-64) DataNode should be capable of managing multiple volumes
Date Tue, 05 Sep 2006 22:18:24 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-64?page=comments#action_12432684 ] 
            
Doug Cutting commented on HADOOP-64:
------------------------------------

I forgot to name the bug in the commit message.  So, for the record, the commit was:
  http://svn.apache.org/viewvc?view=rev&revision=440508

> DataNode should be capable of managing multiple volumes
> -------------------------------------------------------
>
>                 Key: HADOOP-64
>                 URL: http://issues.apache.org/jira/browse/HADOOP-64
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.2.0
>            Reporter: Sameer Paranjpye
>         Assigned To: Milind Bhandarkar
>            Priority: Minor
>             Fix For: 0.6.0
>
>         Attachments: multiple-volumes.patch
>
>
> The dfs Datanode can only store data on a single filesystem volume. When a node runs
its disks JBOD this means running a Datanode per disk on the machine. While the scheme works
reasonably well on small clusters, on larger installations (several 100 nodes) it implies
a very large number of Datanodes with associated management overhead in the Namenode.
> The Datanod should be enhanced to be able to handle multiple volumes on a single machine.

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