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https://issues.apache.org/jira/browse/HADOOP-14301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15966310#comment-15966310
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Mingliang Liu commented on HADOOP-14301:
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Thanks [~cnauroth] for the review and commit!
> Deprecate SharedInstanceProfileCredentialsProvider in branch-2.
> ---------------------------------------------------------------
>
> Key: HADOOP-14301
> URL: https://issues.apache.org/jira/browse/HADOOP-14301
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Fix For: 2.9.0
>
> Attachments: HADOOP-14248-branch-2.002.patch
>
>
> [HADOOP-13727] added the {{SharedInstanceProfileCredentialsProvider}}, which
> effectively reduces high number of connections to EC2 Instance Metadata
> Service caused by {{InstanceProfileCredentialsProvider}}. That patch, in
> order to prevent the throttling problem, defined new class
> {{SharedInstanceProfileCredentialsProvider}} as a subclass of
> {{InstanceProfileCredentialsProvider}}, which enforces creation of only a
> single instance.
> Per [HADOOP-13050], we upgraded the AWS Java SDK. Since then, the
> {{InstanceProfileCredentialsProvider}} in SDK code internally enforces a
> singleton. {{SharedInstanceProfileCredentialsProvider}} can be deprecated as
> of release 2.9.0.
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