Chris Nauroth created HADOOP-13727:

             Summary: S3A: Reduce high number of connections to EC2 Instance 
Metadata Service caused by InstanceProfileCredentialsProvider.
                 Key: HADOOP-13727
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/s3
            Reporter: Rajesh Balamohan
            Assignee: Chris Nauroth

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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