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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13727) S3A: Reduce high number of connections to EC2 Instance Metadata Service caused by InstanceProfileCredentialsProvider.
Date Mon, 17 Oct 2016 22:28:58 GMT
Chris Nauroth created HADOOP-13727:
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             Summary: 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


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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