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https://issues.apache.org/jira/browse/HADOOP-13727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15594776#comment-15594776
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Steve Loughran commented on HADOOP-13727:
-----------------------------------------
Ideally it'd be good to do the whole test suite to verify that IAM works across
the lot, however I think we can take the fact that your test suite, which does
use IAM, scaled up, is implicitly a sign that the auth mechanism works
> 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, HADOOP-13727-branch-2.003.patch,
> HADOOP-13727-branch-2.004.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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