On Fri, Sep 13, 2013 at 12:05 AM, Mike Spreitzer <mspreitz at us.ibm.com>wrote: > > From: Nirmal Ranganathan <rnirmal at gmail.com> > > ... > > > 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. > > > What if there are more than three racks, but some are better choices than > others (perhaps even some are ruled out) due to considerations of various > sorts of capacity and usage? > 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. > > Thanks, > Mike > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev at lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20130913/edc1dd1e/attachment.html>