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From Jean-Marc Spaggiari <jean-m...@spaggiari.org>
Subject Re: confused info about region-regionserver locality
Date Thu, 04 Apr 2013 15:25:50 GMT

I think you're right and documentation need to be updated.

The 3rd replica is written on a random node in the same rack as the
2nd replica. I will double check. Can you please open a JIRA so this
is updated?


2013/4/4 KIM JUN YOUNG <juneng603@me.com>:
> Hi All.
> There is confused understanding about region-regionser locality.
> from the current document ,
> http://hbase.apache.org/book/regions.arch.html
> 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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