Open Stack

> From: Nirmal Ranganathan <rnirmal at gmail.com>
> ...
> Well that's left upto the specific block placement policies in hdfs,
> all we are providing with the topology information is a hint on 
> node/rack placement.

Oh, you are looking at the placement of HDFS blocks within the fixed 
storage volumes, not choosing where to put the storage volumes.  In that 
case I understand and agree that simply providing identifiers from the 
infrastructure to the middleware (HDFS) will suffice.  Coincidentally my 
group is working on this very example right now in our own environment. We 
have a holistic scheduler that is given a whole template to place, and it 
returns placement information.  We imagine, as does Hadoop, a general 
hierarchy in the physical layout, and the holistic scheduler returns, for 
each VM, the path from the root to the VM's host.

Regards,
Mike
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