Steve Loughran commented on HADOOP-13873:

+list https proxy settings being picked up in httpclient

> log DNS addresses on s3a init
> -----------------------------
>                 Key: HADOOP-13873
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13873
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Priority: Minor
> HADOOP-13871 has shown that network problems can kill perf, and that it's v. 
> hard to track down, even if you turn up the logging in hadoop.fs.s3a and 
> com.amazon layers to debug.
> we could maybe improve things by printing out the IPAddress of the s3 
> endpoint, as that could help with the network tracing. Printing from within 
> hadoop shows the one given to S3a, not a different one returned by any load 
> balancer.

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