Support machines with multiple NICs

[graebm]

Describe the feature

AWS has a growing list of instance types with multiple NICs. There should be some way to configure the S3 client to use a particular network interface (or multiple network interfaces?)

Use Case

Maximum throughput cannot be achieved with all instances of the S3 client using just the one default network interface.

Proposed Solution

• S3 client takes IP of network interface to bind its connections to
• If multiple IPs passed, the S3 client distributes connections among them all

Other Information

Mountpoint (which uses aws-c-s3) recently received this feature request: awslabs/mountpoint-s3#815

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

[jmklix]

awslabs/aws-c-io#467

[waahm7]

This is now supported through https://github.com/awslabs/aws-c-s3/blob/main/include/aws/s3/s3_client.h#L552.