Ask HN: How many 9s did AWS lose due to the last outage (us-east-1 incident)?
AWS recently published a postmortem on the October 2025 us-east-1 outage [1]. A DNS race condition in DynamoDB cascaded across EC2, Lambda, Redshift, and NLB, leading to ~14 hours of degraded operations for new instance launches and knock-on effects on multiple services. Has anyone quantitatively modelled AWS’s effective availability once you account for inter-service dependencies inside their control plane and data plane? In other words: if EC2 depends on DynamoDB, and Lambda depends on EC2 + NLB, what’s the composite availability in practice? [1] - https://ift.tt/z6OiFN2 1 comments on Hacker News.
AWS recently published a postmortem on the October 2025 us-east-1 outage [1]. A DNS race condition in DynamoDB cascaded across EC2, Lambda, Redshift, and NLB, leading to ~14 hours of degraded operations for new instance launches and knock-on effects on multiple services. Has anyone quantitatively modelled AWS’s effective availability once you account for inter-service dependencies inside their control plane and data plane? In other words: if EC2 depends on DynamoDB, and Lambda depends on EC2 + NLB, what’s the composite availability in practice? [1] - https://ift.tt/z6OiFN2
AWS recently published a postmortem on the October 2025 us-east-1 outage [1]. A DNS race condition in DynamoDB cascaded across EC2, Lambda, Redshift, and NLB, leading to ~14 hours of degraded operations for new instance launches and knock-on effects on multiple services. Has anyone quantitatively modelled AWS’s effective availability once you account for inter-service dependencies inside their control plane and data plane? In other words: if EC2 depends on DynamoDB, and Lambda depends on EC2 + NLB, what’s the composite availability in practice? [1] - https://ift.tt/z6OiFN2 1 comments on Hacker News.
AWS recently published a postmortem on the October 2025 us-east-1 outage [1]. A DNS race condition in DynamoDB cascaded across EC2, Lambda, Redshift, and NLB, leading to ~14 hours of degraded operations for new instance launches and knock-on effects on multiple services. Has anyone quantitatively modelled AWS’s effective availability once you account for inter-service dependencies inside their control plane and data plane? In other words: if EC2 depends on DynamoDB, and Lambda depends on EC2 + NLB, what’s the composite availability in practice? [1] - https://ift.tt/z6OiFN2
Hacker News story: Ask HN: How many 9s did AWS lose due to the last outage (us-east-1 incident)?
![Hacker News story: Ask HN: How many 9s did AWS lose due to the last outage (us-east-1 incident)?]()
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October 23, 2025
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