GitHub user michaelrommel closed the discussion with a comment: (rust) Huge 
memory consumption, when recv+streaming 1k chunks to S3

Not yet @Xuanwo! I need to first rule out that it is due to my code. I have 
patched both libunftp and unftp-sbe-opendal to add two things I need - once a 
STOR request comes in, I reach out to a valkey instance and get some metadata. 
Then I store the file in a different location based on the metadata. In 
addition I add the metadata to the context and I have a `put_meta()` function 
parallel to `put()` that stores the file in S3 together with the metadata. Then 
I have implemented a custom AWS Elastic Container metadata credential fetch 
mechanism, because the current version of opendal 0.55 cannot work with the 
newer reqsign crate that would support the ECS metadata... So I always need to 
make sure, that a minimal example exhibits the same behaviour before I open an 
issue...

GitHub link: 
https://github.com/apache/opendal/discussions/7200#discussioncomment-15900772

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