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https://issues.apache.org/jira/browse/HADOOP-13319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Nauroth resolved HADOOP-13319.
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Resolution: Duplicate
> S3A to list InstanceProfileCredentialsProvider after
> EnvironmentVariableCredentialsProvider
> -------------------------------------------------------------------------------------------
>
> Key: HADOOP-13319
> URL: https://issues.apache.org/jira/browse/HADOOP-13319
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Attachments: HADOOP-13252-branch-2-001.patch
>
>
> S3A now has a default list of credential providers to pick up AWS credentials
> from
> The environment variable provider added in HADOOP-12807 should go before the
> {{InstanceProfileCredentialsProvider}} one in the list, as it does a simple
> env var checkup. In contrast {{InstanceProfileCredentialsProvider}} does an
> HTTP request *even when not running on EC2*. It may block for up to 2s to
> await a timeout, and network problems could take longer.
> Checking env vars is a low cost operation that shouldn't have to wait for a
> network timeout before being picked up.
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