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From Derek Williams <de...@fyrie.net>
Subject Re: Uneven effective ownership
Date Wed, 13 Nov 2013 13:15:21 GMT
The problem is that NetworkTopologyStrategy will try to pick nodes that
have a different rack when going around the ring, so the second node in
each rack always gets skipped unless it was the first node picked. Your
nodes is eu-west go a,a,b,b,c,c but they should be a,b,c,a,b,c.


On Wed, Nov 13, 2013 at 11:46 AM, Katriel Traum <katriel@google.com> wrote:

> Hello list,
>
> I have a problem with my cluster ownership not being as expected.
>
> I have 2 DC cluster using NetworkTopologyStrategy on and
> EC2MultiRegionSnitch with cassandra 1.1.5. My placement strategy for all
> keyspaces is: {eu-west: 3, us-east:3 }, and I have 6 nodes in eu-west and 3
> in us-east.
> I expected the resulting effective ownership for nodes in us-east to be
> 100% (Which it is), and %50 in eu-west (Which it is not).
>
> The cluster started out with 3 nodes in eu-west, and after adding 3 more
> nodes, I got the following effective ownership:
>
> 1.1.1.1  eu-west     1a          Up     Normal  89.33 GB        83.33%
>          0
> 2.2.2.1  us-east      1b          Up     Normal  88.84 GB        100.00%
>           1
> 1.1.1.4  eu-west     1a          Up     Normal  75.61 GB        16.67%
>          28356863910078205288614550619314017621
> 1.1.1.2  eu-west     1b          Up     Normal  89 GB             83.33%
>            56713727820156410577229101238628035242
> 2.2.2.2  us-east      1d          Up     Normal  88.34 GB        100.00%
>           56713727820156410577229101238628035243
> 1.1.1.5  eu-west     1b          Up     Normal  75.43 GB        16.67%
>          85070591730234615865843651857942052863
> 1.1.1.3  eu-west     1c          Up     Normal  81.1 GB           83.33%
>            113427455640312821154458202477256070484
> 2.2.2.3  us-east      1e          Up     Normal  93.22 GB        100.00%
>           113427455640312821154458202477256070485
> 1.1.1.6  eu-west     1c          Up     Normal  75.39 GB         16.67%
>            141784319550391026443072753096570088105
>
> What am I missing here?
>
> TIA,
> Katriel
>



-- 
Derek Williams

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