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Write confirmation from 1 slave in each DC (say 2 DC)
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dhsieh  
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 More options May 23 2012, 6:41 pm
From: dhsieh <dhsi...@gmail.com>
Date: Wed, 23 May 2012 15:41:45 -0700 (PDT)
Local: Wed, May 23 2012 6:41 pm
Subject: Write confirmation from 1 slave in each DC (say 2 DC)
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Assuming using Java Driver 2.8.0, wonder if there is a way to write
confirmation from 1 slave in each DC (say 2 DC). This is to ensure
that subsequent reads in each DC will get latest write copy with
slaveOk().

 
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Eliot Horowitz  
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 More options May 23 2012, 8:27 pm
From: Eliot Horowitz <el...@10gen.com>
Date: Wed, 23 May 2012 20:27:38 -0400
Local: Wed, May 23 2012 8:27 pm
Subject: Re: [mongodb-user] Write confirmation from 1 slave in each DC (say 2 DC)
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Have you read this:
http://www.mongodb.org/display/DOCS/Data+Center+Awareness


 
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dhsieh  
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 More options May 23 2012, 9:17 pm
From: dhsieh <dhsi...@gmail.com>
Date: Wed, 23 May 2012 18:17:12 -0700 (PDT)
Local: Wed, May 23 2012 9:17 pm
Subject: Re: Write confirmation from 1 slave in each DC (say 2 DC)
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Yes, but what's not clear is if slaveOk read (assuming java driver
v2.8.0) will guarantee returning latest copy from the local DC tagged
slave node. Even that's the case, won't it cause local calls directed
to that tagged slave node and thus causing unbalanced load, will it?

 
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dhsieh  
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 More options May 23 2012, 10:14 pm
From: dhsieh <dhsi...@gmail.com>
Date: Wed, 23 May 2012 19:14:42 -0700 (PDT)
Local: Wed, May 23 2012 10:14 pm
Subject: Re: Write confirmation from 1 slave in each DC (say 2 DC)
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To be specific, is there a read option to select from DC tagged slave
nodes in local DC?

 
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dhsieh  
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 More options May 24 2012, 3:45 pm
From: dhsieh <dhsi...@gmail.com>
Date: Thu, 24 May 2012 12:45:03 -0700 (PDT)
Local: Thurs, May 24 2012 3:45 pm
Subject: Re: Write confirmation from 1 slave in each DC (say 2 DC)
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I see that Java Driver 2.8.0 contains an improvement:

 [JAVA-474] - Support ReadPreference Tagging

I wonder if this is the feature that will address my need for this
posting?


 
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Eliot Horowitz  
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 More options May 27 2012, 12:59 pm
From: Eliot Horowitz <el...@10gen.com>
Date: Sun, 27 May 2012 12:59:49 -0400
Local: Sun, May 27 2012 12:59 pm
Subject: Re: [mongodb-user] Re: Write confirmation from 1 slave in each DC (say 2 DC)
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Yes - that is what you want.


 
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