Chris Nauroth updated HADOOP-13727:
    Attachment: HADOOP-13727-branch-2.002.patch

Thank you, Steve.  I am attaching revision 002 with your suggestions.  I used 
{{<ol>}} for the JavaDocs, because the ordering is significant.

> S3A: Reduce high number of connections to EC2 Instance Metadata Service 
> caused by InstanceProfileCredentialsProvider.
> ---------------------------------------------------------------------------------------------------------------------
>                 Key: HADOOP-13727
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13727
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Rajesh Balamohan
>            Assignee: Chris Nauroth
>            Priority: Minor
>         Attachments: HADOOP-13727-branch-2.001.patch, 
> HADOOP-13727-branch-2.002.patch
> When running in an EC2 VM, S3A can make use of 
> {{InstanceProfileCredentialsProvider}} from the AWS SDK to obtain credentials 
> from the EC2 Instance Metadata Service.  We have observed that for a highly 
> multi-threaded application, this may generate a high number of calls to the 
> Instance Metadata Service.  The service may throttle the client by replying 
> with an HTTP 429 response or forcibly closing connections.  We can greatly 
> reduce the number of calls to the service by enforcing that all threads use a 
> single shared instance of {{InstanceProfileCredentialsProvider}}.

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