Chapter 4. Tigase Advanced Clustering Strategy (ACS)
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# Chapter 4. Tigase Advanced Clustering Strategy (ACS)

Tigase Team <team@tigase.com> v8.2.1, 2022-03-25 :numbered:

## Design and implementation

### ACS

ACS is our general purpose, commercial clustering strategy designed for more or less typical XMPP installations easily scaling to millions and beyond of online users without limit on cluster nodes. The load tests we have run over the code were included a user database with 100mln accounts and an average roster size of up to 150, but that’s not the limit.

### Design

The clustering strategy is based on sharing information between cluster nodes about online users. Who is online and where the user is connected. Communication between cluster nodes is processed with the highest priority to ensure minimal delays with online user data population. An efficient synchronization mechanism allows for a minimal traffic between cluster nodes and distributing accurate data about connecting and disconnecting users.

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