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From "Konstantin Naryshkin" <konstant...@a-bb.net>
Subject Re: Configuring multi DC cluster
Date Thu, 15 Sep 2011 15:28:50 GMT
Wait, his nodes are going SC, SC, AT, AT. Shouldn't they go SC, AT, SC, AT? By which I mean
that if he adds another node to the ring (or lowers the replication factor), he will have
a node that is under-utilized. The rings in his data centers have the tokens:
SC: 0, 1
AT: 85070591730234615865843651857942052864, 85070591730234615865843651857942052865

They should be:
SC: 0, 85070591730234615865843651857942052864
AT: 1, 85070591730234615865843651857942052865

Or did I forget/misread something?

----- Original Message -----
From: "aaron morton" <aaron@thelastpickle.com>
To: user@cassandra.apache.org
Sent: Tuesday, September 13, 2011 6:19:16 PM
Subject: Re: Configuring multi DC cluster

Looks good to me. Last time I checked the Partitioner did not take the DC into consideration
https://issues.apache.org/jira/browse/CASSANDRA-3047


Good luck.







-----------------
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com


On 14/09/2011, at 8:41 AM, Anand Somani wrote:


Hi,

Just trying to setup a cluster of 4 nodes for multiDC scenario - with 2 nodes in each DC.
This is all on the same box just for testing the configuration aspect. I have configured things
as

    • PropertyFile


        • 127.0.0.4=SC:rack1 127.0.0.5=SC:rack2 127.0.0.6=AT:rack1 127.0.0.7=AT:rack2 #
default for unknown nodes default=SC:rack1
    •
Setup initial tokens as - advised     • configured keyspace with SC:2, AT:2
    • ring looks like


        • Address Status State Load Owns Token 85070591730234615865843651857942052865 127.0.0.4
Up Normal 464.98 KB 50.00% 0 127.0.0.5 Up Normal 464.98 KB 0.00% 1 127.0.0.6 Up Normal 464.99
KB 50.00% 85070591730234615865843651857942052864 127.0.0.7 Up Normal 464.99 KB 0.00% 85070591730234615865843651857942052865

Is that what I should expect the ring to look like? Is there anything else I should be testing/validating
to make sure that things are configured correctly for NTS?

Thanks
Anand


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