Steve Loughran created HADOOP-13319:
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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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