Only obtain a bearer token once at a time #415
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✅ A new PR has been created in buildah to vendor these changes: containers/buildah#6448 |
... because we will make it more complex. Should not change behavior. Signed-off-by: Miloslav Trmač <[email protected]>
... to decrease indentation and remove a variable. Should not change behavior. Signed-off-by: Miloslav Trmač <[email protected]>
We will want to manage concurrency in more detail. Should not change behavior. Signed-off-by: Miloslav Trmač <[email protected]>
We will want to add a lock to it, so we must stop copying it by value. Should not change behavior. Signed-off-by: Miloslav Trmač <[email protected]>
Instead of having getBearerToken* construct a new bearerToken object, have the caller provide one. This will allow us to record that a token is being obtained, so that others can wait for it. Should not change behavior. Signed-off-by: Miloslav Trmač <[email protected]>
Currently, on pushes, we can start several concurrent layer pushes; each one will check for a bearer token in tokenCache, find none, and ask the server for one, and then write it into the cache. So, we can hammer the server with 6 basically-concurrent token requests. That's unnecessary, slower than just asking once, and potentially might impact rate limiting heuristics. Instead, serialize writes to a bearerToken so that we only have one request in flight at a time. This does not benefit pulls, where the first request is for a manifest; that obtains a token, so subsequent concurrent layer pulls will not request a token again. Signed-off-by: Miloslav Trmač <[email protected]>
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Currently, on pushes, we can start several concurrent layer pushes; each one will check for a bearer token in tokenCache, find none, and ask the server for one, and then write it into the cache.
So, we can hammer the server with 6 basically-concurrent token requests. That's unnecessary, slower than just asking once, and potentially might impact rate limiting heuristics.
Instead, serialize writes to a bearerToken so that we only have one request in flight at a time.
This does not benefit pulls, where the first request is for a manifest, which obtains a token, so subsequent concurrent layer pulls will not request a token again.
See individual commit messages for details.
(This continues, and updates, containers/image#1968 .)