Posts tagged agave.

Agave runs the simulateTransaction handler synchronously on its shared Tokio executor threads, so unauthenticated, gas-free simulate requests pin those workers and add queue latency across the validator's entire JSON-RPC tier — not just the simulate path.

The DoS class that scales against validators isn't volumetric. It's small requests that cost the node real work before it authenticates the caller. The pattern we keep finding across clients, and the fix.

Three architectural findings in the Agave JSON-RPC layer at v3.1.9: response amplification on getMultipleAccounts, Tokio executor saturation via simulateTransaction, and spawn_blocking pool saturation via getProgramAccounts. Architectural patterns, not rate-limit DoS - operator rate limits don't close them.