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Not host capacity, just a opaque reference to distinguish a host is enough.
Hadoop can use that information to appropriately place block replicas. For
example if the replication count is 3, and if a host/rack topology is
provided to Hadoop, it will place each replica on a different host/rack
granted one is available.


On Thu, Sep 12, 2013 at 11:29 PM, Mike Spreitzer <mspreitz at us.ibm.com>wrote:

> > From: Alexander Kuznetsov <akuznetsov at mirantis.com>
> > ...
>
> > Currently Nova doesn’t provide information about the host of virtual
> > machine for non admin users. Is it possible to change this
> > situation? This information is needed in Hadoop deployment case.
> > Because now Hadoop aware about virtual environment and this
> > knowledge help Hadoop to achieve a better performance and robustness.
>
>
> How must host information are you looking for?  Do you want to know the
> capacities of the hosts?  Do you want to know about all the guests of the
> hosts?  If so, why is this only a Savanna issue?  If not, how much good is
> limited host information going to do Savanna?
>
> Thanks,
> Mike
> _______________________________________________
> OpenStack-dev mailing list
> OpenStack-dev at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>
>


-- 
Nirmal
----------------------------
http://rnirmal.com
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