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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13319) S3A to list InstanceProfileCredentialsProvider after EnvironmentVariableCredentialsProvider
Date Fri, 24 Jun 2016 08:33:48 GMT
Steve Loughran created HADOOP-13319:
---------------------------------------

             Summary: 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


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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