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 <mspre...@us.ibm.com>wrote: > > From: Alexander Kuznetsov <akuznet...@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@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > > -- Nirmal ---------------------------- http://rnirmal.com
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