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xiaoxin-ren
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Aug 30, 2022
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After further research, I findthat this header 'x-emc-copy-mode' would only work in Multi-Part Copy API (Copy Range). So first I remove the header in Copy Object request, and wouldn't anymore add it in Copy Part request.
Based on communication with object heads dev, ECS extension API: Copy Range, which is not an S3 API, is introduced. It's like a general need by users, not only DataDomain.
S3's Upload Part - Copy API might have these two problems. 1) when we have tons of parts in objects, it would cause a lot of transaction overhead to create all the part objects and have a lot of partial GC in deep copy mode. 2) The "recipe" should somehow put into the body of the request to bypass the server limits on HTTP headers.
Here is the design doc, https://confluence.cec.lab.emc.com/display/ECS/Copy+Range+API+Design.