Hi Marc,

On Sat, Aug 25, 2012 at 12:56 AM, Marc Sturlese <[EMAIL PROTECTED]> wrote:

Just to keep in mind: All HBase read/write requests are made via the
RS. The RS's held blocks of HDFS data isn't directly accessed by any
client (RS is THE data server for HBase client).

Yes, you can guarantee this to a certain extent. In case data-locality
is absent in some tasks (due to scheduling constraints), a few blocks
may be read out by the RS-node's DNs, but shouldn't be a big impact
given that a good scheduler in MR usually helps avoid having to do

Alternatively you can also consider running low-slotted TTs to use up
the RS machines but in a safer way.

Harsh J
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