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https://issues.apache.org/jira/browse/HADOOP-13727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15591413#comment-15591413
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Steve Loughran commented on HADOOP-13727:
-----------------------------------------
LGTM, +1, pending
# it passing a full test run against your endpoint
# you doing a look at the generated aws site page (or a github/markdown editor)
to make sure the 1. 2 ... bullet points are pulled out. I think you may need an
extra line.
Rajesh or someone running on EC2 will presumably need to check that it works
too —we aren't testing that, are we? (though presumably you could run the
integration tests using IAM to pick up the credentials —has someone done that?)
> 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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