On Fri, Sep 13, 2013 at 12:05 AM, Mike Spreitzer <mspre...@us.ibm.com>wrote:

> > From: Nirmal Ranganathan <rnir...@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
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