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https://issues.apache.org/jira/browse/HADOOP-14237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15941514#comment-15941514
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Mingliang Liu commented on HADOOP-14237:
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In latest aws-java-sdk, it's a singleton instance so we can live without
SharedInstanceProfileCredentialsProvider.
> S3A Support Shared Instance Profile Credentials Across All Instances
> --------------------------------------------------------------------
>
> Key: HADOOP-14237
> URL: https://issues.apache.org/jira/browse/HADOOP-14237
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/s3
> Affects Versions: 2.8.0, 3.0.0-alpha1, 3.0.0-alpha2, 2.8.1
> Environment: EC2, AWS
> Reporter: Kazuyuki Tanimura
>
> When I run a large Hadoop cluster on EC2 instances with IAM Role, it fails
> getting the instance profile credentials, eventually all jobs on the cluster
> fail. Since a number of S3A clients (all mappers and reducers) try to get the
> credentials, the AWS credential endpoint starts responding 5xx and 4xx error
> codes.
> SharedInstanceProfileCredentialsProvider.java is sort of trying to solve it,
> but it still does not share the credentials with other EC2 instances /
> processes.
> This issue prevents users from creating Hadoop clusters on EC2
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