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HAS is implemented based on an active/active high availability architecture (HAS - Active-Active High Availability Architecture), where each component of HAS can scale horizontally independent of the others. This also allows HAS to have highly scalable hybrid deployment architectures (OOF Beijing R2 OOM Deployment Planning).
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HAS is service agnostic by design and the OOF-HAS Homing Specification Guide can help create homing specifications for new services.
Triaging Homing decisions
HAS Developer guide
The HAS Developer Guide will give more information on how to deploy HAS, and contributing to the HAS code.
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