Core concept
Choose vCPU (0.25-16) + memory. Task starts, runs, exits (batch) or long-running (service). Auto-networking + IAM per task.
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How it works
~3x cost of equivalent EC2 spot. Cold start 30-60s for task creation. No underlying host access = harder debugging.
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Trade-offs + gotchas
Sporadic workloads. Small teams without infra expertise. When operational simplicity > cost. Not for high-frequency short jobs (use Lambda).