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Add in-memory cache of spawned EC2 instances - #838

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Kobzol wants to merge 3 commits into
rust-lang:mainfrom
Kobzol:ec2-token-cache
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Add in-memory cache of spawned EC2 instances#838
Kobzol wants to merge 3 commits into
rust-lang:mainfrom
Kobzol:ec2-token-cache

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@Kobzol

@Kobzol Kobzol commented Sep 9, 2026

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To avoid erroring out into logs when the idempotency token is rejected by EC2, due to starting multiple instances for the same job.

I also forbid starting EC2 instances for unknown branches.

Fixes: #830

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Most / all EC2 instance starts "fail" with IdempotentParameterMismatch

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