> From: Nirmal Ranganathan <rnir...@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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