[Storage] Cache encryption key if high level api spans across multiple service calls.#22069
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kasobol-msft merged 3 commits intoAzure:mainfrom Jun 23, 2021
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[Storage] Cache encryption key if high level api spans across multiple service calls.#22069kasobol-msft merged 3 commits intoAzure:mainfrom
kasobol-msft merged 3 commits intoAzure:mainfrom
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…e service calls. (#22069) * this test catches the problem. * cache the content key. * changelog.
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* [Storage] Cache encryption key if high level api spans across multiple service calls. (#22069) * this test catches the problem. * cache the content key. * changelog. * prep release. (#22072) * Increment version for storage releases (#22081) Increment package version after release of Azure.Storage.Blobs Co-authored-by: Azure SDK Bot <53356347+azure-sdk@users.noreply.github.com>
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When user is using client side encryption and uses relatively small buffer to perform download/openread operations then this puts unnecessary pressure on keyvault because we'd call to unwrap encryption key for each chunk.
For example OpenRead for 4GB blob and reading it's content will issue ~1000 unwrap requests as openread uses 4MB buffer by default.
This PR has optimization that caches encryption key for the lifespan of DownloadTo and Stream returned from OpenRead to avoid this.