The OCI Distribution Spec is not great, it does not read like a specification that was carefully designed.
> According to the specification, a layer push must happen sequentially: even if you upload the layer in chunks, each chunk needs to finish uploading before you can move on to the next one.
As far as I've tested with DockerHub and GHCR, chunked upload is broken anyways, and clients upload each blob/layer as a whole. The spec also promotes `Content-Range` value formats that do not match the RFC7233 format.
(That said, there's parallelism on the level of blobs, just not per blob)
Another gripe of mine is that they missed the opportunity to standardize pagination of listing tags, because they accidentally deleted some text from the standard [1]. Now different registries roll their own.
[1] https://github.com/opencontainers/distribution-spec/issues/4...
> According to the specification, a layer push must happen sequentially: even if you upload the layer in chunks, each chunk needs to finish uploading before you can move on to the next one.
As far as I've tested with DockerHub and GHCR, chunked upload is broken anyways, and clients upload each blob/layer as a whole. The spec also promotes `Content-Range` value formats that do not match the RFC7233 format.
(That said, there's parallelism on the level of blobs, just not per blob)
Another gripe of mine is that they missed the opportunity to standardize pagination of listing tags, because they accidentally deleted some text from the standard [1]. Now different registries roll their own.
[1] https://github.com/opencontainers/distribution-spec/issues/4...