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From Matthew Dennis <mden...@datastax.com>
Subject Re: Coordinator node
Date Tue, 15 Feb 2011 22:45:36 GMT
You have a single HAProxy node in front of the cluster or you have a HAProxy
node on each machine that is a client of Cassandra that points at all the
nodes in the cluster?

The former has a SPOF and bottleneck (the HAProxy instance), the latter does
not (and is somewhat common, especially for things like Apache+PHP).

On Tue, Feb 15, 2011 at 4:41 PM, Attila Babo <babo.online@gmail.com> wrote:

> We are using haproxy in TCP mode for round-robin with great succes.
> It's bit unorthodox but has same real added values like logging.
>
> Here is the relavant config for haproxy:
>
> #####
>
> global
>    log 127.0.0.1 local0
>    log 127.0.0.1 local1 notice
>    maxconn 4096
>    user haproxy
>    group haproxy
>    daemon
>
> defaults
>    log global
>    mode tcp
>    maxconn 2000
>    contimeout 5000
>    clitimeout 50000
>    srvtimeout 50000
>
> listen cassandra 0.0.0.0:9160
>    balance roundrobin
>    server db1 ec2-XXX.compute-1.amazonaws.com:9160 check observe layer4
>    server db2 ec2-YYY.compute-1.amazonaws.com:9160 check observe layer4
>    server db3 ec2-ZZZ.compute-1.amazonaws.com:9160 check observe layer4
>

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