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From Tyler Hobbs <ty...@datastax.com>
Subject Re: High loads only on one node in the cluster
Date Fri, 01 Nov 2013 16:34:49 GMT
On Fri, Nov 1, 2013 at 5:07 AM, Rakesh Rajan <rakeshxp@gmail.com> wrote:

>
> 1) By alternating racks, do you mean to alternate racks between all nodes
> in a single DC v/s multiple DCs? AWS EastCoast has 4 AZs
> and Singapore has 2 AZs. So is the final solution something like this:
> ip11 - East Coast - m1.xlarge / us-east-1b         - Token: 0
> ip21 - Singapore  - m1.xlarge / ap-southeast-1a - Token: 1001
> ip12 - East Coast - m1.xlarge / us-east-*1c*         -
> Token: 28356863910078205288614550619314017621
> ip13 - East Coast - m1.xlarge / us-east-*1d*         -
> Token: 56713727820156410577229101238628035241
> ip22 - Singapore  - m1.xlarge / ap-southeast-1b -
> Token: 56713727820156410577229101238628036241
> ip14 - East Coast - m1.xlarge / us-east-*1a*         -
> Token: 85070591730234615865843651857942052863
> ip15 - East Coast - m1.xlarge / us-east-*1b*         -
> Token: 113427455640312821154458202477256070484
> ip23 - Singapore  - m1.xlarge / ap-southeast-*1a* -
> Token: 113427455640312821154458202477256071484
> ip16 - East Coast - m1.xlarge / us-east-*1c*         -
> Token: 141784319550391026443072753096570088105
>
> Is this what you had suggested?
>

That would be more balanced than your current setup, but it would still be
unbalanced, especially the ap-southeast DC.  To have a perfectly balanced
cluster with multiple racks, you need to a) have the same number of nodes
on each rack, and b) alternate racks within each DC.  Your new layout would
meet requirement (b), but not (a).  This is why I suggest using the same
rack for all nodes.


-- 
Tyler Hobbs
DataStax <http://datastax.com/>

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