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Parallel layer upload for s3 cache #5270

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merged 1 commit into from
Aug 28, 2024

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@bpaquet bpaquet commented Aug 25, 2024

This PR allows to use multiple go routines to upload layers to S3 in parallel.
Parallelism is controlled by upload_parallelism

Individually, each layer is already send in parallel, using the standard Upload Manager provided by the S3 SDK.

Inspired by 6c439bd.

README.md Outdated
@@ -578,6 +578,7 @@ Other options are:
* Multiple manifest names can be specified at the same time, separated by `;`. The standard use case is to use the git sha1 as name, and the branch name as duplicate, and load both with 2 `import-cache` commands.
* `ignore-error=<false|true>`: specify if error is ignored in case cache export fails (default: `false`)
* `touch_refresh=24h`: Instead of being uploaded again when not changed, blobs files will be "touched" on s3 every `touch_refresh`, default is 24h. Due to this, an expiration policy can be set on the S3 bucket to cleanup useless files automatically. Manifests files are systematically rewritten, there is no need to touch them.
* `upload_parallelism=10`: This parameter changes the number of layers uploaded to s3 in parallel. Each individual layer is uploaded with 5 threads, using the Upload manager provided by the AWS SDK.
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Isn't 10 maybe bit too big for default? In registry we use 4 (+1 for meta-requests) as a default https://github.com/moby/buildkit/blob/master/util/resolver/limited/group.go#L23

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Ok, I set it to 4

Signed-off-by: Bertrand Paquet <bertrand.paquet@gmail.com>
@tonistiigi tonistiigi merged commit 6fdac94 into moby:master Aug 28, 2024
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