ForceDream Research OS · FD-2026-004
Spot-Instance Eviction Safeguard: Zero-Loss Agent State Preservation Under Cloud Preemption Events
WORM Access Seal · L828
fd2026004d2b7e9a
Cloud spot instance eviction events present a critical reliability challenge for long-running AI agent workloads. We introduce SIES, combining a predictive eviction monitor achieving 91.4% true positive rate at 30-second prediction horizon with an atomic state checkpoint daemon. Zero-loss state preservation across 10,000 simulated eviction events and 0.3-second recovery latency in production.
1. Problem Statement
Spot and preemptible cloud instances offer 60-90% cost reduction versus on-demand pricing but introduce eviction risk. An eviction mid-task can corrupt agent state, destroy in-flight billing records, produce orphaned WORM seals, and trigger duplicate task execution on recovery.
2. Predictive Eviction Monitor
The PEM consumes four cloud metadata signals at 5-second intervals: spot price delta, capacity signals from the instance metadata service, historical eviction frequency distribution, and system-level signals (CPU steal time, memory pressure). A lightweight gradient boosting classifier achieves 91.4% TPR and 3.2% FPR at the 30-second horizon.
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