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Harbor is using the distribution for it's (harbor-registry) registry component. The harbor GC will call into the registry to delete the manifest, which in turn then does a lookup for all tags that reference the deleted manifest. To find the tag references, the registry will iterate every tag in the repository and read it's link file to check if it matches the deleted manifest (i.e. to see if uses the same sha256 digest). So, the more tags in repository, the worse the performance will be (as there will be more s3 API calls occurring for the tag directory lookups and tag file reads). Therefore, we can use concurrent lookup and untag to optimize performance as described in https://github.com/goharbor/harbor/issues/12948. P.S. This optimization was originally contributed by @Antiarchitect, now I would like to take it over. Thanks @Antiarchitect's efforts with PR https://github.com/distribution/distribution/pull/3890. Signed-off-by: Liang Zheng <zhengliang0901@gmail.com> |
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