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From Michael Segel <michael_se...@hotmail.com>
Subject Re: Multidata center support
Date Thu, 05 Sep 2013 01:15:08 GMT
Sorry, its a poor idea period. 

Its one thing for something like Cleversafe to span a data center, but you're also having
unit of work in terms of map/reduce. 

Think about all of the bad things that can happen when you have to deal with a sort/shuffle
stage across data centers... 
(Its not a pretty sight.) 

As Adam points out... DR and copies across data centers are one thing. 
Running a single cluster spanning data centers...

I would hate to be you when you have to face your devOps team. Does the expression BOFH ring
a bell? ;-) 



On Aug 30, 2013, at 5:26 AM, Adam Muise <amuise@hortonworks.com> wrote:

> Nothing has changed. DR best practice is still one (or more) clusters per site and replication
is handled via distributed copy or some variation of it. A cluster spanning multiple data
centers is a poor idea right now.
> On Fri, Aug 30, 2013 at 12:35 AM, Rahul Bhattacharjee <rahul.rec.dgp@gmail.com>
> My take on this.
> Why hadoop has to know about data center thing. I think it can be installed across multiple
data centers , however topology configuration would be required to tell which node belongs
to which data center and switch for block placement.
> Thanks,
> Rahul
> On Fri, Aug 30, 2013 at 12:42 AM, Baskar Duraikannu <baskar.duraikannu@outlook.com>
> We have a need to setup hadoop across data centers.  Does hadoop support multi data center
configuration? I searched through archives and have found that hadoop did not support multi
data center configuration some time back. Just wanted to see whether situation has changed.
> Please help.
> -- 
> Adam Muise
> Solution Engineer
> Hortonworks
> amuise@hortonworks.com
> 416-417-4037
> Hortonworks - Develops, Distributes and Supports Enterprise Apache Hadoop.
> Hortonworks Virtual Sandbox
> Hadoop: Disruptive Possibilities by Jeff Needham
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The opinions expressed here are mine, while they may reflect a cognitive thought, that is
purely accidental. 
Use at your own risk. 
Michael Segel
michael_segel (AT) hotmail.com

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