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To: user@cassandra.apache.org
From: Oleg Dulin  <oleg.dulin@gmail.com>
Subject: Re: Why is my cluster imbalanced ?
Date: Mon, 7 Apr 2014 09:48:50 -0400
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Tupshin:

For EC2, 3 us-east, would you recommend RF=3 ? That would make sense, 
wouldn't it...

That's what I'll do for production.

Oleg

On 2014-04-07 12:23:51 +0000, Tupshin Harper said:

> Your us-east datacenter, has RF=2, and 2 racks, which is the right way
> to do it (I would rarely recommend using a different number of racks
> than your RF). But by having three nodes on one rack (1b) and only one
> on the other(1a), you are telling Cassandra to distribute the data so
> that no two copies of the same partition exist on the same rack.
> 
> So with rack ownership of 100% and 100% respectively, there is no even
> way to distribute your data among those four nodes.
> 
> tl;dr Switch node 2 to rack 1a.
> 
> -Tupshin
> 
> 
> 
> On Mon, Apr 7, 2014 at 8:08 AM, Oleg Dulin <oleg.dulin@gmail.com> wrote:
>> I added two more nodes on Friday, and moved tokens around.
>> 
>> For four nodes, the tokesn should be:
>> 
>> Node #1:                                        0
>> Node #2:   42535295865117307932921825928971026432
>> Node #3:   85070591730234615865843651857942052864
>> Node #4:  127605887595351923798765477786913079296
>> 
>> And yet my ring status shows this (for a specific keyspace). RF=2.
>> 
>> Datacenter: us-east
>> ==========
>> Replicas: 2
>> 
>> Address        Rack        Status State   Load            Owns
>> Token
>> 
>> 42535295865117307932921825928971026432
>> x.x.x.1  1b          Up     Normal  13.51 GB        25.00%
>> 127605887595351923798765477786913079296
>> x.x.x.2  1b          Up     Normal  4.46 GB         25.00%
>> 85070591730234615865843651857942052164
>> x.x.x.3  1a          Up     Normal  62.58 GB        100.00%             0
>> x.x.x.4  1b          Up     Normal  66.71 GB        50.00%
>> 42535295865117307932921825928971026432
>> 
>> Datacenter: us-west
>> ==========
>> Replicas: 1
>> 
>> Address        Rack        Status State   Load            Owns
>> Token
>> 
>> x.x.x.5   1b          Up     Normal  62.72 GB        100.00%             100
>> --
>> Regards,
>> Oleg Dulin
>> http://www.olegdulin.com


-- 
Regards,
Oleg Dulin
http://www.olegdulin.com