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From KIM JUN YOUNG <juneng...@me.com>
Subject confused info about region-regionserver locality
Date Thu, 04 Apr 2013 10:01:48 GMT
Hi All. 

There is confused understanding about region-regionser locality.

from the current document ,

9.7.3. Region-RegionServer Locality
Over time, Region-RegionServer locality is achieved via HDFS block replication. The HDFS client
does the following by default when choosing locations to write replicas:

First replica is written to local node
Second replica is written to another node in same rack
Third replica is written to a node in another rack (if sufficient nodes)

but, my understanding is different
HDFS write blocks for replica

	first, local node
	second, another node in another rack
	third, random another node in same rack

need to be changed? or am I missing something?
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