How to configure ADK agent for multi-region failover?

[dgsec00-ctrl]

Hi,

I need to configure my ADK agent for multi-region failover between us-central1 and europe-west1. Is there built-in support for this?

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Environment:

• Python 3.11
• google-adk 1.30.0
• GCP multi-region setup

Thanks!

[adk-bot]

Response from ADK Answering Agent (experimental, answer may be inaccurate)

TLDR: ADK doesn't have a built-in, automated multi-region failover feature, but it provides the necessary components to build this architecture yourself. The key is to run stateless agent instances in each region and manage the session state in a shared, multi-regional database like Firestore.

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Hello!

While ADK does not offer a one-click solution for multi-region failover, it is designed with components that allow you to build a resilient, multi-region architecture. Here’s a recommended approach to achieve your goal of failing over between us-central1 and europe-west1:

1. Stateless Agent Deployments: You should deploy identical, stateless instances of your ADK agent to both the us-central1 and europe-west1 regions. The agents themselves should not store any long-term session state.

2. Shared Session State: The most critical piece of this architecture is managing conversation state. You can configure ADK's SessionService to use an external, multi-regional persistence layer. Google Cloud Firestore is an excellent choice for this. By storing session history in a shared Firestore database, an agent in europe-west1 can seamlessly take over a conversation that was previously handled by an agent in us-central1 (and vice-versa). You can find guidance on setting this up in the documentation. [1]

3. Global Traffic Management: Place a global load balancer (such as Google Cloud Load Balancing) in front of your regional deployments. You can configure it to direct traffic to your primary region and automatically fail over to the secondary region if the primary becomes unhealthy.

4. Resilience Features: Leverage ADK’s built-in resilience capabilities for each regional deployment, such as automatic reconnection and session resumption, to handle transient network issues gracefully. [2]

By combining these strategies, you can build a robust, highly available ADK agent that can withstand a regional failure.

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[1] Session State Management using Firestore: https://google.github.io/adk-docs/integrations/firestore-session-service/
[2] Raw Live API v. ADK Gemini Live API Toolkit: https://google.github.io/adk-docs/streaming/dev-guide/part1/