Fix check-then-act race condition #1284
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This was referenced Sep 29, 2023
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christian-schilling
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Sep 30, 2023
All crates in workspace are now 2021 Rust commit-id:e6fac661
The semaphore is aquired after the conditions for fetching are already evaluated. It means that multiple threads/runners can decide to fetch simultaneously and then wait on the same semaphore, even though only one fetch is needed. Therefore, fetch would happen more often than what is specified in fetch times, and requests can be slow under load. commit-id:a4cd58e6
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The semaphore is aquired after the conditions for fetching are already
evaluated. It means that multiple threads/runners can decide to fetch
simultaneously and then wait on the same semaphore, even though only one
fetch is needed. Therefore, fetch would happen more often than what is
specified in fetch times, and requests can be slow under load.
commit-id:a4cd58e6
Stack: