HAProxy is frequently used as a software load balancer in the MySQL world. Peter Boros, in a past post, explained how to set it up with Percona XtraDB Cluster (PXC) so that it only sends queries to available nodes. The same approach can be used in a regular master-slaves setup to spread the read load across [&]

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http://www.percona.com/blog/2014/12/18/making-haproxy-1-5-replication-lag-aware-in-mysql/