Zen Load Balancer is a complete solution for load balancing to provide high availability for TCP and UDP services and data line communications, targeted to become a professional open source product in networking for distributed systems. Not only a nice HTTPS GUI to control the load balancing system, Zen LB provides an advanced administration for network interfaces and routes, unlimited farms configuration, advanced checking for TCP farms, advanced check and monitoring for backend servers, clustering for active-passive load balancing services, monitoring graphs, configuration backups, VLAN support, real time config sync replication for cluster nodes, HTTP specific load balancing, client persistence, SSL wrapper, and much more.
Hades is a high availability (HA) data source. This HA data source contains two other data sources: the main one and the failover one. The HA data source exposes one of them at a time and can automatically switch between them when certain conditions are met. These conditions are highly configurable. By default, when the main data source is overloaded, the failover data source is used. The load of a data base is determined on the basis of the average execution time of some configurable SQL statement that is examined periodically. The HA data source exposes through JMX its state and also operations for manual switching between the two contained data sources in case automatic switching must be suppressed for some reason.